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[PATCH 7/7] Teach snapshot builder to skip transactions running REPACK (CONCURRENTLY). 80+ messages / 1 participants [nested] [flat]
* [PATCH 7/7] Teach snapshot builder to skip transactions running REPACK (CONCURRENTLY). @ 2026-03-17 19:22 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-03-17 19:22 UTC (permalink / raw) During logical decoding, we need to know if particular transaction performed catalog changes because catalog information is needed to construct heap tuples. To be sure that we have enough information of each transaction, the logical decoding cannot start before all the already running transactions have completed. The problem with REPACK (CONCURRENTLY) is that it has XID assigned and writes WAL records marked with it. Thus if another backend runs REPACK (CONCURRENTLY) and tries to setup the logical decoding, it has to wait for the completion of all the other transactions involved in REPACK (CONCURRENTLY). However, REPACK (CONCURRENTLY) does not perform any catalog changes relevant to logical decoding, so the other backends executing this command can ignore it. This patch implements it by adding information about transactions executing the command to the xl_running_xacts WAL record, and by teaching the snapshot builder to use the information. --- src/backend/access/rmgrdesc/standbydesc.c | 15 ++++- src/backend/access/transam/xlog.c | 2 + src/backend/commands/cluster.c | 16 +++++ src/backend/replication/logical/snapbuild.c | 38 ++++++++--- src/backend/storage/ipc/procarray.c | 73 +++++++++++++++++++-- src/backend/storage/ipc/standby.c | 6 +- src/include/access/xlog_internal.h | 2 +- src/include/storage/proc.h | 3 +- src/include/storage/standby.h | 3 + src/include/storage/standbydefs.h | 2 + 10 files changed, 138 insertions(+), 22 deletions(-) diff --git a/src/backend/access/rmgrdesc/standbydesc.c b/src/backend/access/rmgrdesc/standbydesc.c index 0a291354ae2..79c052d3607 100644 --- a/src/backend/access/rmgrdesc/standbydesc.c +++ b/src/backend/access/rmgrdesc/standbydesc.c @@ -21,10 +21,11 @@ standby_desc_running_xacts(StringInfo buf, xl_running_xacts *xlrec) { int i; - appendStringInfo(buf, "nextXid %u latestCompletedXid %u oldestRunningXid %u", + appendStringInfo(buf, "nextXid %u latestCompletedXid %u oldestRunningXid %u oldestRunningXid %u", xlrec->nextXid, xlrec->latestCompletedXid, - xlrec->oldestRunningXid); + xlrec->oldestRunningXid, + xlrec->oldestRunningXidLogical); if (xlrec->xcnt > 0) { appendStringInfo(buf, "; %d xacts:", xlrec->xcnt); @@ -41,6 +42,16 @@ standby_desc_running_xacts(StringInfo buf, xl_running_xacts *xlrec) for (i = 0; i < xlrec->subxcnt; i++) appendStringInfo(buf, " %u", xlrec->xids[xlrec->xcnt + i]); } + + if (xlrec->xcnt_repack > 0) + { + TransactionId *xids_repack; + + appendStringInfo(buf, "; %d xacts_repack:", xlrec->xcnt_repack); + xids_repack = xlrec->xids + xlrec->xcnt + xlrec->subxcnt; + for (i = 0; i < xlrec->xcnt_repack; i++) + appendStringInfo(buf, " %u", xids_repack[i]); + } } void diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index f5c9a34374d..d050b0b1444 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -5912,6 +5912,7 @@ StartupXLOG(void) * subxids are listed with their parent prepared transactions. */ running.xcnt = nxids; + running.xcnt_repack = 0; running.subxcnt = 0; running.subxid_status = SUBXIDS_IN_SUBTRANS; running.nextXid = XidFromFullTransactionId(checkPoint.nextXid); @@ -8477,6 +8478,7 @@ xlog_redo(XLogReaderState *record) * with their parent prepared transactions. */ running.xcnt = nxids; + running.xcnt_repack = 0; running.subxcnt = 0; running.subxid_status = SUBXIDS_IN_SUBTRANS; running.nextXid = XidFromFullTransactionId(checkPoint.nextXid); diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c index 4fd10a5e7b3..73407c383da 100644 --- a/src/backend/commands/cluster.c +++ b/src/backend/commands/cluster.c @@ -1086,6 +1086,22 @@ rebuild_relation(Relation OldHeap, Relation index, bool verbose, if (concurrent) { + /* + * Do not let other backends wait for our completion during their + * setup of logical replication. Unlike logical replication publisher, + * we will have XID assigned, so the other backends - whether + * walsenders involved in logical replication or regular backends + * executing also REPACK (CONCURRENTLY) - would have to wait for our + * completion before they can build their initial snapshot. It is + * o.k. for any decoding backend to ignore us because we do not change + * tuple descriptor of any table, and the data changes we write should + * not be decoded by other backends. + */ + LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE); + MyProc->statusFlags |= PROC_IN_REPACK; + ProcGlobal->statusFlags[MyProc->pgxactoff] = MyProc->statusFlags; + LWLockRelease(ProcArrayLock); + /* * The worker needs to be member of the locking group we're the leader * of. We ought to become the leader before the worker starts. The diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c index 9cf499ce7c6..fbdd4600a2b 100644 --- a/src/backend/replication/logical/snapbuild.c +++ b/src/backend/replication/logical/snapbuild.c @@ -1172,7 +1172,7 @@ SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn, xl_running_xact * xmin, which looks odd but is correct and actually more efficient, since * we hit fast paths in heapam_visibility.c. */ - builder->xmin = running->oldestRunningXid; + builder->xmin = running->oldestRunningXidLogical; /* Remove transactions we don't need to keep track off anymore */ SnapBuildPurgeOlderTxn(builder); @@ -1188,9 +1188,9 @@ SnapBuildProcessRunningXacts(SnapBuild *builder, XLogRecPtr lsn, xl_running_xact */ xmin = ReorderBufferGetOldestXmin(builder->reorder); if (xmin == InvalidTransactionId) - xmin = running->oldestRunningXid; + xmin = running->oldestRunningXidLogical; elog(DEBUG3, "xmin: %u, xmax: %u, oldest running: %u, oldest xmin: %u", - builder->xmin, builder->xmax, running->oldestRunningXid, xmin); + builder->xmin, builder->xmax, running->oldestRunningXidLogical, xmin); LogicalIncreaseXminForSlot(lsn, xmin); /* @@ -1275,14 +1275,14 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn * have all necessary catalog rows anymore. */ if (TransactionIdIsNormal(builder->initial_xmin_horizon) && - NormalTransactionIdPrecedes(running->oldestRunningXid, + NormalTransactionIdPrecedes(running->oldestRunningXidLogical, builder->initial_xmin_horizon)) { ereport(DEBUG1, errmsg_internal("skipping snapshot at %X/%08X while building logical decoding snapshot, xmin horizon too low", LSN_FORMAT_ARGS(lsn)), errdetail_internal("initial xmin horizon of %u vs the snapshot's %u", - builder->initial_xmin_horizon, running->oldestRunningXid)); + builder->initial_xmin_horizon, running->oldestRunningXidLogical)); SnapBuildWaitSnapshot(running, builder->initial_xmin_horizon); @@ -1299,7 +1299,7 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn * NB: We might have already started to incrementally assemble a snapshot, * so we need to be careful to deal with that. */ - if (running->oldestRunningXid == running->nextXid) + if (running->oldestRunningXidLogical == running->nextXid) { if (!XLogRecPtrIsValid(builder->start_decoding_at) || builder->start_decoding_at <= lsn) @@ -1378,14 +1378,14 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn /* * c) transition from BUILDING_SNAPSHOT to FULL_SNAPSHOT. * - * In BUILDING_SNAPSHOT state, and this xl_running_xacts' oldestRunningXid + * In BUILDING_SNAPSHOT state, and this xl_running_xacts' oldestRunningXidLogical * is >= than nextXid from when we switched to BUILDING_SNAPSHOT. This * means all transactions starting afterwards have enough information to * be decoded. Switch to FULL_SNAPSHOT. */ else if (builder->state == SNAPBUILD_BUILDING_SNAPSHOT && TransactionIdPrecedesOrEquals(builder->next_phase_at, - running->oldestRunningXid)) + running->oldestRunningXidLogical)) { builder->state = SNAPBUILD_FULL_SNAPSHOT; builder->next_phase_at = running->nextXid; @@ -1402,14 +1402,14 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn /* * c) transition from FULL_SNAPSHOT to CONSISTENT. * - * In FULL_SNAPSHOT state, and this xl_running_xacts' oldestRunningXid is + * In FULL_SNAPSHOT state, and this xl_running_xacts' oldestRunningXidLogical is * >= than nextXid from when we switched to FULL_SNAPSHOT. This means all * transactions that are currently in progress have a catalog snapshot, * and all their changes have been collected. Switch to CONSISTENT. */ else if (builder->state == SNAPBUILD_FULL_SNAPSHOT && TransactionIdPrecedesOrEquals(builder->next_phase_at, - running->oldestRunningXid)) + running->oldestRunningXidLogical)) { builder->state = SNAPBUILD_CONSISTENT; builder->next_phase_at = InvalidTransactionId; @@ -1459,6 +1459,24 @@ SnapBuildWaitSnapshot(xl_running_xacts *running, TransactionId cutoff) if (TransactionIdFollows(xid, cutoff)) continue; + /* Do not wait for transactions running REPACK (CONCURRENTLY). */ + if (running->xcnt_repack > 0) + { + TransactionId *xids_repack; + int i; + + xids_repack = running->xids + running->xcnt + running->subxcnt; + + for (i = 0; i < running->xcnt_repack; i++) + { + if (xid == xids_repack[i]) + break; + } + /* Found? */ + if (i < running->xcnt_repack) + continue; + } + XactLockTableWait(xid, NULL, NULL, XLTW_None); } diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c index 0f913897acc..f1a03e6a754 100644 --- a/src/backend/storage/ipc/procarray.c +++ b/src/backend/storage/ipc/procarray.c @@ -2643,15 +2643,24 @@ GetRunningTransactionData(void) RunningTransactions CurrentRunningXacts = &CurrentRunningXactsData; TransactionId latestCompletedXid; TransactionId oldestRunningXid; + TransactionId oldestRunningXidLogical; TransactionId oldestDatabaseRunningXid; TransactionId *xids; int index; - int count; + int count, count_repack; int subcount; bool suboverflowed; + TransactionId *xids_repack = NULL; + bool logical_decoding_enabled = IsLogicalDecodingEnabled(); Assert(!RecoveryInProgress()); + /* + * TODO Consider a GUC to reserve certain amount of replication slots for + * REPACK (CONCURRENTLY) and using it here. + */ +#define MAX_REPACK_XIDS 16 + /* * Allocating space for maxProcs xids is usually overkill; numProcs would * be sufficient. But it seems better to do the malloc while not holding @@ -2663,11 +2672,13 @@ GetRunningTransactionData(void) */ if (CurrentRunningXacts->xids == NULL) { + int nrepack = logical_decoding_enabled ? MAX_REPACK_XIDS : 0; + /* * First call */ CurrentRunningXacts->xids = (TransactionId *) - malloc(TOTAL_MAX_CACHED_SUBXIDS * sizeof(TransactionId)); + malloc((TOTAL_MAX_CACHED_SUBXIDS + nrepack) * sizeof(TransactionId)); if (CurrentRunningXacts->xids == NULL) ereport(ERROR, (errcode(ERRCODE_OUT_OF_MEMORY), @@ -2676,7 +2687,10 @@ GetRunningTransactionData(void) xids = CurrentRunningXacts->xids; - count = subcount = 0; + if (logical_decoding_enabled) + xids_repack = palloc_array(TransactionId, MAX_REPACK_XIDS); + + count = subcount = count_repack = 0; suboverflowed = false; /* @@ -2688,7 +2702,7 @@ GetRunningTransactionData(void) latestCompletedXid = XidFromFullTransactionId(TransamVariables->latestCompletedXid); - oldestDatabaseRunningXid = oldestRunningXid = + oldestDatabaseRunningXid = oldestRunningXid = oldestRunningXidLogical = XidFromFullTransactionId(TransamVariables->nextXid); /* @@ -2697,6 +2711,8 @@ GetRunningTransactionData(void) for (index = 0; index < arrayP->numProcs; index++) { TransactionId xid; + int pgprocno; + PGPROC *proc; /* Fetch xid just once - see GetNewTransactionId */ xid = UINT32_ACCESS_ONCE(other_xids[index]); @@ -2716,6 +2732,21 @@ GetRunningTransactionData(void) if (TransactionIdPrecedes(xid, oldestRunningXid)) oldestRunningXid = xid; + if (logical_decoding_enabled && + TransactionIdPrecedes(xid, oldestRunningXidLogical)) + { + /* + * Backends running REPACK concurrently need to be excluded from + * oldestRunningXidLogical, otherwise the snapshot builder cannot + * proceed in building the initial snapshot. + */ + pgprocno = arrayP->pgprocnos[index]; + proc = &allProcs[pgprocno]; + + if ((proc->statusFlags & PROC_IN_REPACK) == 0) + oldestRunningXidLogical = xid; + } + /* * Also, update the oldest running xid within the current database. As * fetching pgprocno and PGPROC could cause cache misses, we do cheap @@ -2723,8 +2754,8 @@ GetRunningTransactionData(void) */ if (TransactionIdPrecedes(xid, oldestDatabaseRunningXid)) { - int pgprocno = arrayP->pgprocnos[index]; - PGPROC *proc = &allProcs[pgprocno]; + pgprocno = arrayP->pgprocnos[index]; + proc = &allProcs[pgprocno]; if (proc->databaseId == MyDatabaseId) oldestDatabaseRunningXid = xid; @@ -2742,6 +2773,19 @@ GetRunningTransactionData(void) */ xids[count++] = xid; + + /* + * Collect XIDSs of transactions running REPACK (CONCURRENTLY). + */ + if (logical_decoding_enabled && + count_repack < MAX_REPACK_XIDS) + { + pgprocno = arrayP->pgprocnos[index]; + proc = &allProcs[pgprocno]; + + if (proc->statusFlags & PROC_IN_REPACK) + xids_repack[count_repack++] = xid; + } } /* @@ -2782,6 +2826,19 @@ GetRunningTransactionData(void) } } + /* + * Append the XIDs running REPACK (CONCURRENTLY), if any. + * + * XXX Should we sort the array and use bsearch() when using it? + */ + if (count_repack > 0) + { + for (int i = 0; i < count_repack; i++) + xids[count++] = xids_repack[i]; + } + if (xids_repack) + pfree(xids_repack); + /* * It's important *not* to include the limits set by slots here because * snapbuild.c uses oldestRunningXid to manage its xmin horizon. If those @@ -2791,11 +2848,13 @@ GetRunningTransactionData(void) * increases if slots do. */ - CurrentRunningXacts->xcnt = count - subcount; + CurrentRunningXacts->xcnt = count - subcount - count_repack; CurrentRunningXacts->subxcnt = subcount; + CurrentRunningXacts->xcnt_repack = count_repack; CurrentRunningXacts->subxid_status = suboverflowed ? SUBXIDS_IN_SUBTRANS : SUBXIDS_IN_ARRAY; CurrentRunningXacts->nextXid = XidFromFullTransactionId(TransamVariables->nextXid); CurrentRunningXacts->oldestRunningXid = oldestRunningXid; + CurrentRunningXacts->oldestRunningXidLogical = oldestRunningXidLogical; CurrentRunningXacts->oldestDatabaseRunningXid = oldestDatabaseRunningXid; CurrentRunningXacts->latestCompletedXid = latestCompletedXid; diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c index f3ad90c7c7a..5c4121fcbc8 100644 --- a/src/backend/storage/ipc/standby.c +++ b/src/backend/storage/ipc/standby.c @@ -1188,6 +1188,7 @@ standby_redo(XLogReaderState *record) RunningTransactionsData running; running.xcnt = xlrec->xcnt; + running.xcnt_repack = xlrec->xcnt_repack; running.subxcnt = xlrec->subxcnt; running.subxid_status = xlrec->subxid_overflow ? SUBXIDS_MISSING : SUBXIDS_IN_ARRAY; running.nextXid = xlrec->nextXid; @@ -1358,10 +1359,12 @@ LogCurrentRunningXacts(RunningTransactions CurrRunningXacts) XLogRecPtr recptr; xlrec.xcnt = CurrRunningXacts->xcnt; + xlrec.xcnt_repack = CurrRunningXacts->xcnt_repack; xlrec.subxcnt = CurrRunningXacts->subxcnt; xlrec.subxid_overflow = (CurrRunningXacts->subxid_status != SUBXIDS_IN_ARRAY); xlrec.nextXid = CurrRunningXacts->nextXid; xlrec.oldestRunningXid = CurrRunningXacts->oldestRunningXid; + xlrec.oldestRunningXidLogical = CurrRunningXacts->oldestRunningXidLogical; xlrec.latestCompletedXid = CurrRunningXacts->latestCompletedXid; /* Header */ @@ -1372,7 +1375,8 @@ LogCurrentRunningXacts(RunningTransactions CurrRunningXacts) /* array of TransactionIds */ if (xlrec.xcnt > 0) XLogRegisterData(CurrRunningXacts->xids, - (xlrec.xcnt + xlrec.subxcnt) * sizeof(TransactionId)); + (xlrec.xcnt + xlrec.xcnt_repack + xlrec.subxcnt) * + sizeof(TransactionId)); recptr = XLogInsert(RM_STANDBY_ID, XLOG_RUNNING_XACTS); diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h index 629ac3a7d3e..1730b07810f 100644 --- a/src/include/access/xlog_internal.h +++ b/src/include/access/xlog_internal.h @@ -31,7 +31,7 @@ /* * Each page of XLOG file has a header like this: */ -#define XLOG_PAGE_MAGIC 0xD11D /* can be used as WAL version indicator */ +#define XLOG_PAGE_MAGIC 0xD11E /* can be used as WAL version indicator */ typedef struct XLogPageHeaderData { diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h index bf3094f0f7d..120370f459d 100644 --- a/src/include/storage/proc.h +++ b/src/include/storage/proc.h @@ -67,10 +67,11 @@ struct XidCache #define PROC_AFFECTS_ALL_HORIZONS 0x20 /* this proc's xmin must be * included in vacuum horizons * in all databases */ +#define PROC_IN_REPACK 0x40 /* currently REPACK (CONCURRENTLY) */ /* flags reset at EOXact */ #define PROC_VACUUM_STATE_MASK \ - (PROC_IN_VACUUM | PROC_IN_SAFE_IC | PROC_VACUUM_FOR_WRAPAROUND) + (PROC_IN_VACUUM | PROC_IN_SAFE_IC | PROC_VACUUM_FOR_WRAPAROUND | PROC_IN_REPACK) /* * Xmin-related flags. Make sure any flags that affect how the process' Xmin diff --git a/src/include/storage/standby.h b/src/include/storage/standby.h index c63a4f2cc6a..0bd28e270f1 100644 --- a/src/include/storage/standby.h +++ b/src/include/storage/standby.h @@ -124,10 +124,13 @@ typedef enum typedef struct RunningTransactionsData { int xcnt; /* # of xact ids in xids[] */ + int xcnt_repack; /* # of xacts running REPACK + * (CONCURRENTLY). */ int subxcnt; /* # of subxact ids in xids[] */ subxids_array_status subxid_status; TransactionId nextXid; /* xid from TransamVariables->nextXid */ TransactionId oldestRunningXid; /* *not* oldestXmin */ + TransactionId oldestRunningXidLogical; TransactionId oldestDatabaseRunningXid; /* same as above, but within the * current database */ TransactionId latestCompletedXid; /* so we can set xmax */ diff --git a/src/include/storage/standbydefs.h b/src/include/storage/standbydefs.h index 231d251fd51..edad609fa9a 100644 --- a/src/include/storage/standbydefs.h +++ b/src/include/storage/standbydefs.h @@ -47,10 +47,12 @@ typedef struct xl_standby_locks typedef struct xl_running_xacts { int xcnt; /* # of xact ids in xids[] */ + int xcnt_repack; /* # of xacts running REPACK (CONCURRENTLY) */ int subxcnt; /* # of subxact ids in xids[] */ bool subxid_overflow; /* snapshot overflowed, subxids missing */ TransactionId nextXid; /* xid from TransamVariables->nextXid */ TransactionId oldestRunningXid; /* *not* oldestXmin */ + TransactionId oldestRunningXidLogical; TransactionId latestCompletedXid; /* so we can set xmax */ TransactionId xids[FLEXIBLE_ARRAY_MEMBER]; -- 2.47.3 --=-=-=-- ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-06-16 11:54 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-06-16 11:54 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 6f3e4ecff46..92c1b678e6f 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -186,6 +186,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2014,13 +2016,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2029,9 +2024,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2063,6 +2056,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2178,15 +2174,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2288,9 +2275,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2391,9 +2377,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2403,6 +2388,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2420,6 +2435,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2436,7 +2452,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2492,37 +2508,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4072,9 +4071,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v01-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
* [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). @ 2026-07-15 08:37 Antonin Houska <[email protected]> 0 siblings, 0 replies; 80+ messages in thread From: Antonin Houska @ 2026-07-15 08:37 UTC (permalink / raw) So far, the relfrozenxid and relminmxid attributes of pg_class used to be updated by swap_relation_files(), however, not every call of the function should do that. On the contrary, new feature of REPACK (CONCURRENTLY) will need to update this information in one case that would be tricky to handle using swap_relation_files(). --- src/backend/commands/repack.c | 114 +++++++++++++++++----------------- 1 file changed, 56 insertions(+), 58 deletions(-) diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c index 89695335127..7390fd303f6 100644 --- a/src/backend/commands/repack.c +++ b/src/backend/commands/repack.c @@ -188,6 +188,8 @@ static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldInde TransactionId *pFreezeXid, MultiXactId *pCutoffMulti, ChangeContext *chgcxt); +static void update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti); static List *get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt); static List *get_tables_to_repack_partitioned(RepackCommand cmd, @@ -2039,13 +2041,6 @@ copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex, * links) while the latter is the only way to handle cases in which a toast * table is added or removed altogether. * - * Additionally, the first relation is marked with relfrozenxid set to - * frozenXid. It seems a bit ugly to have this here, but the caller would - * have to do it anyway, so having it here saves a heap_update. Note: in - * the swap-toast-links case, we assume we don't need to change the toast - * table's relfrozenxid: the new version of the toast table should already - * have relfrozenxid set to RecentXmin, which is good enough. - * * Lastly, if r2 and its toast table and toast index (if any) are mapped, * their OIDs are emitted into mapped_tables[]. This is hacky but beats * having to look the information up again later in finish_heap_swap. @@ -2054,9 +2049,7 @@ static void swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, bool swap_toast_by_content, bool is_internal, - TransactionId frozenXid, - MultiXactId cutoffMulti, - Oid *mapped_tables) + Oid *mapped_tables, Oid *r1_toastid) { Relation relRelation; HeapTuple reltup1, @@ -2088,6 +2081,9 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, relam1 = relform1->relam; relam2 = relform2->relam; + if (r1_toastid) + *r1_toastid = relform1->reltoastrelid; + if (RelFileNumberIsValid(relfilenumber1) && RelFileNumberIsValid(relfilenumber2)) { @@ -2203,15 +2199,6 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, * and then fail to commit the pg_class update. */ - /* set rel1's frozen Xid and minimum MultiXid */ - if (relform1->relkind != RELKIND_INDEX) - { - Assert(!TransactionIdIsValid(frozenXid) || - TransactionIdIsNormal(frozenXid)); - relform1->relfrozenxid = frozenXid; - relform1->relminmxid = cutoffMulti; - } - /* swap size statistics too, since new rel has freshly-updated stats */ { int32 swap_pages; @@ -2313,9 +2300,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - frozenXid, - cutoffMulti, - mapped_tables); + mapped_tables, + NULL); } else { @@ -2416,9 +2402,8 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, target_is_pg_class, swap_toast_by_content, is_internal, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); } /* Clean up. */ @@ -2428,6 +2413,36 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class, table_close(relRelation, RowExclusiveLock); } +/* + * Update relfrozenxid and relminmxid attributes of pg_class entry, specified + * by OID. + */ +static void +update_relation_cutoffs(Oid relid, TransactionId frozenXid, + MultiXactId cutoffMulti) +{ + Relation relRelation; + HeapTuple reltup; + Form_pg_class relform; + CatalogIndexState indstate; + + relRelation = table_open(RelationRelationId, RowExclusiveLock); + reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid)); + if (!HeapTupleIsValid(reltup)) + elog(ERROR, "cache lookup failed for relation %u", relid); + relform = (Form_pg_class) GETSTRUCT(reltup); + relform->relfrozenxid = frozenXid; + relform->relminmxid = cutoffMulti; + + indstate = CatalogOpenIndexes(relRelation); + CatalogTupleUpdateWithInfo(relRelation, &reltup->t_self, reltup, + indstate); + CatalogCloseIndexes(indstate); + + heap_freetuple(reltup); + table_close(relRelation, RowExclusiveLock); +} + /* * Remove the transient table that was built by make_new_heap, and finish * cleaning up (including rebuilding all indexes on the old heap). @@ -2445,6 +2460,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, { ObjectAddress object; Oid mapped_tables[4]; + Oid oid_old_toastid; int i; /* Report that we are now swapping relation files */ @@ -2461,7 +2477,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, swap_relation_files(OIDOldHeap, OIDNewHeap, (OIDOldHeap == RelationRelationId), swap_toast_by_content, is_internal, - frozenXid, cutoffMulti, mapped_tables); + mapped_tables, &oid_old_toastid); /* * If it's a system catalog, queue a sinval message to flush all catcaches @@ -2517,37 +2533,20 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap, PROGRESS_REPACK_PHASE_FINAL_CLEANUP); /* - * If the relation being rebuilt is pg_class, swap_relation_files() - * couldn't update pg_class's own pg_class entry (check comments in - * swap_relation_files()), thus relfrozenxid was not updated. That's - * annoying because a potential reason for doing a VACUUM FULL is a - * imminent or actual anti-wraparound shutdown. So, now that we can - * access the new relation using its indices, update relfrozenxid. - * pg_class doesn't have a toast relation, so we don't need to update the - * corresponding toast relation. Not that there's little point moving all - * relfrozenxid updates here since swap_relation_files() needs to write to - * pg_class for non-mapped relations anyway. + * Update relfrozenxid and relminmxid. CCI is needed to see the most + * recent pg_class tuple, created by swap_relation_files(). However that + * CCI makes us use the new relation file. Therefore we cannot do this + * before indexes have been rebuilt too. */ - if (OIDOldHeap == RelationRelationId) - { - Relation relRelation; - HeapTuple reltup; - Form_pg_class relform; - - relRelation = table_open(RelationRelationId, RowExclusiveLock); - - reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(OIDOldHeap)); - if (!HeapTupleIsValid(reltup)) - elog(ERROR, "cache lookup failed for relation %u", OIDOldHeap); - relform = (Form_pg_class) GETSTRUCT(reltup); - - relform->relfrozenxid = frozenXid; - relform->relminmxid = cutoffMulti; - - CatalogTupleUpdate(relRelation, &reltup->t_self, reltup); + CommandCounterIncrement(); + update_relation_cutoffs(OIDOldHeap, frozenXid, cutoffMulti); - table_close(relRelation, RowExclusiveLock); - } + /* + * The same for TOAST, if needed. In the swap-toast-links case, the new + * the toast table should already have relfrozenxid set to RecentXmin. + */ + if (OidIsValid(oid_old_toastid) && swap_toast_by_content) + update_relation_cutoffs(oid_old_toastid, frozenXid, cutoffMulti); /* Destroy new heap with old filenumber */ object.classId = RelationRelationId; @@ -4133,9 +4132,8 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap, (old_table_oid == RelationRelationId), false, /* swap_toast_by_content */ true, - InvalidTransactionId, - InvalidMultiXactId, - mapped_tables); + mapped_tables, + NULL); #ifdef USE_ASSERT_CHECKING -- 2.52.0 --=-=-= Content-Type: text/plain Content-Disposition: attachment; filename=v02-0008-Make-REPACK-CONCURRENTLY-MVCC-safe.patch ^ permalink raw reply [nested|flat] 80+ messages in thread
end of thread, other threads:[~2026-07-15 08:37 UTC | newest] Thread overview: 80+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2026-03-17 19:22 [PATCH 7/7] Teach snapshot builder to skip transactions running REPACK (CONCURRENTLY). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-06-16 11:54 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]> 2026-07-15 08:37 [PATCH 7/8] Decouple updating of freezing information from swap_relation_files(). Antonin Houska <[email protected]>
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