pg.ddx.io pgsql-hackers@postgresql.org mailing list archive help / color / mirror / Atom feed From: Nathan Bossart <nathandbossart@gmail.com>
To: Daniel Gustafsson <daniel@yesql.se>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Subject: Re: improve performance of pg_dump --binary-upgrade
Date: Thu, 18 Apr 2024 16:19:24 -0500
Message-ID: <20240418211924.GA3828609@nathanxps13> (raw )
In-Reply-To: <93129B02-33E0-4591-96B4-0B9C2183C7B4@yesql.se >
References: <20240418041712.GA3441570@nathanxps13 >
<F579A6BD-C431-4043-B58C-FE5B07FC2977@yesql.se >
<20240418152301.GB3501884@nathanxps13 >
<20240418202813.GA3669511@nathanxps13 >
<93129B02-33E0-4591-96B4-0B9C2183C7B4@yesql.se >
On Thu, Apr 18, 2024 at 10:33:08PM +0200, Daniel Gustafsson wrote:
> From a read-through they look good, a very nice performance improvement in an
> important path. I think it would be nice with some comments on the
> BinaryUpgradeClassOids struct (since the code using it is thousands of lines
> away), and a comment on the if (oids == NULL) block explaining the caching.
Added. Thanks for reviewing! Unfortunately, this one will have to sit for
a couple months...
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
Attachments: download all (2 files, .tar.gz)
v3-0001-Remove-is_index-parameter-from-binary_upgrade_set.patch (text/x-diff, 3.7K) download
From 6797e4e1fc1a63f710ed0a409b1337880eb91ad4 Mon Sep 17 00:00:00 2001
From: Nathan Bossart <nathan@postgresql.org>
Date: Thu, 18 Apr 2024 15:15:19 -0500
Subject: [PATCH v3 1/2] Remove is_index parameter from
binary_upgrade_set_pg_class_oids().
---
src/bin/pg_dump/pg_dump.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 6d2f3fdef3..58c77a5e2b 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -324,7 +324,7 @@ static void binary_upgrade_set_type_oids_by_rel(Archive *fout,
const TableInfo *tbinfo);
static void binary_upgrade_set_pg_class_oids(Archive *fout,
PQExpBuffer upgrade_buffer,
- Oid pg_class_oid, bool is_index);
+ Oid pg_class_oid);
static void binary_upgrade_extension_member(PQExpBuffer upgrade_buffer,
const DumpableObject *dobj,
const char *objtype,
@@ -5394,8 +5394,7 @@ binary_upgrade_set_type_oids_by_rel(Archive *fout,
static void
binary_upgrade_set_pg_class_oids(Archive *fout,
- PQExpBuffer upgrade_buffer, Oid pg_class_oid,
- bool is_index)
+ PQExpBuffer upgrade_buffer, Oid pg_class_oid)
{
PQExpBuffer upgrade_query = createPQExpBuffer();
PGresult *upgrade_res;
@@ -5444,7 +5443,8 @@ binary_upgrade_set_pg_class_oids(Archive *fout,
appendPQExpBufferStr(upgrade_buffer,
"\n-- For binary upgrade, must preserve pg_class oids and relfilenodes\n");
- if (!is_index)
+ if (relkind != RELKIND_INDEX &&
+ relkind != RELKIND_PARTITIONED_INDEX)
{
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_heap_pg_class_oid('%u'::pg_catalog.oid);\n",
@@ -11864,7 +11864,7 @@ dumpCompositeType(Archive *fout, const TypeInfo *tyinfo)
binary_upgrade_set_type_oids_by_type_oid(fout, q,
tyinfo->dobj.catId.oid,
false, false);
- binary_upgrade_set_pg_class_oids(fout, q, tyinfo->typrelid, false);
+ binary_upgrade_set_pg_class_oids(fout, q, tyinfo->typrelid);
}
qtypname = pg_strdup(fmtId(tyinfo->dobj.name));
@@ -15998,7 +15998,7 @@ dumpTableSchema(Archive *fout, const TableInfo *tbinfo)
if (dopt->binary_upgrade)
binary_upgrade_set_pg_class_oids(fout, q,
- tbinfo->dobj.catId.oid, false);
+ tbinfo->dobj.catId.oid);
appendPQExpBuffer(q, "CREATE VIEW %s", qualrelname);
@@ -16100,7 +16100,7 @@ dumpTableSchema(Archive *fout, const TableInfo *tbinfo)
if (dopt->binary_upgrade)
binary_upgrade_set_pg_class_oids(fout, q,
- tbinfo->dobj.catId.oid, false);
+ tbinfo->dobj.catId.oid);
appendPQExpBuffer(q, "CREATE %s%s %s",
tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
@@ -16990,7 +16990,7 @@ dumpIndex(Archive *fout, const IndxInfo *indxinfo)
if (dopt->binary_upgrade)
binary_upgrade_set_pg_class_oids(fout, q,
- indxinfo->dobj.catId.oid, true);
+ indxinfo->dobj.catId.oid);
/* Plain secondary index */
appendPQExpBuffer(q, "%s;\n", indxinfo->indexdef);
@@ -17244,7 +17244,7 @@ dumpConstraint(Archive *fout, const ConstraintInfo *coninfo)
if (dopt->binary_upgrade)
binary_upgrade_set_pg_class_oids(fout, q,
- indxinfo->dobj.catId.oid, true);
+ indxinfo->dobj.catId.oid);
appendPQExpBuffer(q, "ALTER %sTABLE ONLY %s\n", foreign,
fmtQualifiedDumpable(tbinfo));
@@ -17653,7 +17653,7 @@ dumpSequence(Archive *fout, const TableInfo *tbinfo)
if (dopt->binary_upgrade)
{
binary_upgrade_set_pg_class_oids(fout, query,
- tbinfo->dobj.catId.oid, false);
+ tbinfo->dobj.catId.oid);
/*
* In older PG versions a sequence will have a pg_type entry, but v14
--
2.25.1
v3-0002-Improve-performance-of-pg_dump-binary-upgrade.patch (text/x-diff, 8.1K) download
From b3ae9df69fdbf386d09250f1c225ecd8665141a7 Mon Sep 17 00:00:00 2001
From: Nathan Bossart <nathan@postgresql.org>
Date: Wed, 17 Apr 2024 22:55:27 -0500
Subject: [PATCH v3 2/2] Improve performance of pg_dump --binary-upgrade.
---
src/bin/pg_dump/pg_dump.c | 126 ++++++++++++++++++++-----------
src/tools/pgindent/typedefs.list | 1 +
2 files changed, 81 insertions(+), 46 deletions(-)
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 58c77a5e2b..b1f06a199b 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -55,6 +55,7 @@
#include "catalog/pg_trigger_d.h"
#include "catalog/pg_type_d.h"
#include "common/connect.h"
+#include "common/int.h"
#include "common/relpath.h"
#include "compress_io.h"
#include "dumputils.h"
@@ -99,6 +100,21 @@ typedef enum OidOptions
zeroAsNone = 4,
} OidOptions;
+/*
+ * This struct is used for the sorted array populated by
+ * binary_upgrade_set_pg_class_oids().
+ */
+typedef struct
+{
+ Oid oid;
+ char relkind;
+ RelFileNumber relfilenode;
+ Oid reltoastrelid;
+ RelFileNumber toast_relfilenode;
+ Oid indexrelid;
+ RelFileNumber toast_index_relfilenode;
+} BinaryUpgradeClassOids;
+
/* global decls */
static bool dosync = true; /* Issue fsync() to make dump durable on disk. */
@@ -5392,18 +5408,60 @@ binary_upgrade_set_type_oids_by_rel(Archive *fout,
pg_type_oid, false, false);
}
+static int
+BinaryUpgradeClassOidsCmp(const void *p1, const void *p2)
+{
+ BinaryUpgradeClassOids v1 = *((const BinaryUpgradeClassOids *) p1);
+ BinaryUpgradeClassOids v2 = *((const BinaryUpgradeClassOids *) p2);
+
+ return pg_cmp_u32(v1.oid, v2.oid);
+}
+
static void
binary_upgrade_set_pg_class_oids(Archive *fout,
PQExpBuffer upgrade_buffer, Oid pg_class_oid)
{
- PQExpBuffer upgrade_query = createPQExpBuffer();
- PGresult *upgrade_res;
- RelFileNumber relfilenumber;
- Oid toast_oid;
- RelFileNumber toast_relfilenumber;
- char relkind;
- Oid toast_index_oid;
- RelFileNumber toast_index_relfilenumber;
+ static BinaryUpgradeClassOids *oids = NULL;
+ static int oids_len = 0;
+ BinaryUpgradeClassOids key = {0, '?', 0, 0, 0, 0, 0};
+ BinaryUpgradeClassOids *entry;
+
+ /*
+ * If this is the first call to this function, gather all the information
+ * we'll need for this call and future calls into a sorted array. This
+ * allows us to avoid executing this expensive query many times.
+ */
+ if (oids == NULL)
+ {
+ PGresult *res;
+
+ res = ExecuteSqlQuery(fout,
+ "SELECT c.oid, c.relkind, c.relfilenode, c.reltoastrelid, ct.relfilenode AS toast_relfilenode, "
+ "i.indexrelid, cti.relfilenode AS toast_index_relfilenode "
+ "FROM pg_catalog.pg_class c LEFT JOIN "
+ "pg_catalog.pg_index i ON (c.reltoastrelid = i.indrelid AND i.indisvalid) "
+ "LEFT JOIN pg_catalog.pg_class ct ON (c.reltoastrelid = ct.oid) "
+ "LEFT JOIN pg_catalog.pg_class AS cti ON (i.indexrelid = cti.oid) "
+ "ORDER BY c.oid;",
+ PGRES_TUPLES_OK);
+
+ oids_len = PQntuples(res);
+ oids = (BinaryUpgradeClassOids *)
+ pg_malloc(oids_len * sizeof(BinaryUpgradeClassOids));
+
+ for (int i = 0; i < oids_len; i++)
+ {
+ oids[i].oid = atooid(PQgetvalue(res, i, 0));
+ oids[i].relkind = *PQgetvalue(res, i, 1);
+ oids[i].relfilenode = atooid(PQgetvalue(res, i, 2));
+ oids[i].reltoastrelid = atooid(PQgetvalue(res, i, 3));
+ oids[i].toast_relfilenode = atooid(PQgetvalue(res, i, 4));
+ oids[i].indexrelid = atooid(PQgetvalue(res, i, 5));
+ oids[i].toast_index_relfilenode = atooid(PQgetvalue(res, i, 6));
+ }
+
+ PQclear(res);
+ }
/*
* Preserve the OID and relfilenumber of the table, table's index, table's
@@ -5416,35 +5474,15 @@ binary_upgrade_set_pg_class_oids(Archive *fout,
* by the new backend, so we can copy the files during binary upgrade
* without worrying about this case.
*/
- appendPQExpBuffer(upgrade_query,
- "SELECT c.relkind, c.relfilenode, c.reltoastrelid, ct.relfilenode AS toast_relfilenode, i.indexrelid, cti.relfilenode AS toast_index_relfilenode "
- "FROM pg_catalog.pg_class c LEFT JOIN "
- "pg_catalog.pg_index i ON (c.reltoastrelid = i.indrelid AND i.indisvalid) "
- "LEFT JOIN pg_catalog.pg_class ct ON (c.reltoastrelid = ct.oid) "
- "LEFT JOIN pg_catalog.pg_class AS cti ON (i.indexrelid = cti.oid) "
- "WHERE c.oid = '%u'::pg_catalog.oid;",
- pg_class_oid);
-
- upgrade_res = ExecuteSqlQueryForSingleRow(fout, upgrade_query->data);
-
- relkind = *PQgetvalue(upgrade_res, 0, PQfnumber(upgrade_res, "relkind"));
-
- relfilenumber = atooid(PQgetvalue(upgrade_res, 0,
- PQfnumber(upgrade_res, "relfilenode")));
- toast_oid = atooid(PQgetvalue(upgrade_res, 0,
- PQfnumber(upgrade_res, "reltoastrelid")));
- toast_relfilenumber = atooid(PQgetvalue(upgrade_res, 0,
- PQfnumber(upgrade_res, "toast_relfilenode")));
- toast_index_oid = atooid(PQgetvalue(upgrade_res, 0,
- PQfnumber(upgrade_res, "indexrelid")));
- toast_index_relfilenumber = atooid(PQgetvalue(upgrade_res, 0,
- PQfnumber(upgrade_res, "toast_index_relfilenode")));
+ key.oid = pg_class_oid;
+ entry = bsearch(&key, oids, oids_len, sizeof(BinaryUpgradeClassOids),
+ BinaryUpgradeClassOidsCmp);
appendPQExpBufferStr(upgrade_buffer,
"\n-- For binary upgrade, must preserve pg_class oids and relfilenodes\n");
- if (relkind != RELKIND_INDEX &&
- relkind != RELKIND_PARTITIONED_INDEX)
+ if (entry->relkind != RELKIND_INDEX &&
+ entry->relkind != RELKIND_PARTITIONED_INDEX)
{
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_heap_pg_class_oid('%u'::pg_catalog.oid);\n",
@@ -5455,35 +5493,33 @@ binary_upgrade_set_pg_class_oids(Archive *fout,
* partitioned tables have a relfilenumber, which should not be
* preserved when upgrading.
*/
- if (RelFileNumberIsValid(relfilenumber) && relkind != RELKIND_PARTITIONED_TABLE)
+ if (RelFileNumberIsValid(entry->relfilenode) && entry->relkind != RELKIND_PARTITIONED_TABLE)
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_heap_relfilenode('%u'::pg_catalog.oid);\n",
- relfilenumber);
+ entry->relfilenode);
/*
* In a pre-v12 database, partitioned tables might be marked as having
* toast tables, but we should ignore them if so.
*/
- if (OidIsValid(toast_oid) &&
- relkind != RELKIND_PARTITIONED_TABLE)
+ if (OidIsValid(entry->reltoastrelid) &&
+ entry->relkind != RELKIND_PARTITIONED_TABLE)
{
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_toast_pg_class_oid('%u'::pg_catalog.oid);\n",
- toast_oid);
+ entry->reltoastrelid);
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_toast_relfilenode('%u'::pg_catalog.oid);\n",
- toast_relfilenumber);
+ entry->toast_relfilenode);
/* every toast table has an index */
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_index_pg_class_oid('%u'::pg_catalog.oid);\n",
- toast_index_oid);
+ entry->indexrelid);
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_index_relfilenode('%u'::pg_catalog.oid);\n",
- toast_index_relfilenumber);
+ entry->toast_index_relfilenode);
}
-
- PQclear(upgrade_res);
}
else
{
@@ -5493,12 +5529,10 @@ binary_upgrade_set_pg_class_oids(Archive *fout,
pg_class_oid);
appendPQExpBuffer(upgrade_buffer,
"SELECT pg_catalog.binary_upgrade_set_next_index_relfilenode('%u'::pg_catalog.oid);\n",
- relfilenumber);
+ entry->relfilenode);
}
appendPQExpBufferChar(upgrade_buffer, '\n');
-
- destroyPQExpBuffer(upgrade_query);
}
/*
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index d551ada325..c8062a1a20 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -255,6 +255,7 @@ BernoulliSamplerData
BgWorkerStartTime
BgwHandleStatus
BinaryArithmFunc
+BinaryUpgradeClassOids
BindParamCbData
BipartiteMatchState
BitString
--
2.25.1
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To: pgsql-hackers@postgresql.org
Cc: nathandbossart@gmail.com, daniel@yesql.se
Subject: Re: improve performance of pg_dump --binary-upgrade
In-Reply-To: <20240418211924.GA3828609@nathanxps13>
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