Subject: [PATCH v12 2/3] add pg_stat_autovacuum_scores system view

From: Nathan Bossart <[email-masked]>
Date: Thu, 2 Apr 2026 15:47:19 -0500

---
 doc/src/sgml/maintenance.sgml        |   6 ++
 doc/src/sgml/monitoring.sgml         | 143 +++++++++++++++++++++++++++
 src/backend/catalog/system_views.sql |  15 +++
 src/backend/postmaster/autovacuum.c  |  70 +++++++++++++
 src/include/catalog/pg_proc.dat      |   7 ++
 src/test/regress/expected/rules.out  |  12 +++
 6 files changed, 253 insertions(+)

diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index 0d2a28207ed..906aca2c228 100644
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -1164,6 +1164,12 @@ analyze threshold = analyze base threshold + analyze scale factor * number of tu
      <literal>2.0</literal> effectively doubles the
      <emphasis>analyze</emphasis> component score.
     </para>
+
+    <para>
+     The <link linkend="monitoring-pg-stat-autovacuum-scores-view">
+     <structname>pg_stat_autovacuum_scores</structname></link>
+     view shows the current scores of all tables in the current database.
+    </para>
    </sect3>
   </sect2>
  </sect1>
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 312374da5e0..b8b2967aa36 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -596,6 +596,16 @@ postgres   27093  0.0  0.0  30096  2752 ?        Ss   11:34   0:00 postgres: ser
       user tables are shown.</entry>
      </row>
 
+     <row>
+      <entry><structname>pg_stat_autovacuum_scores</structname><indexterm><primary>pg_stat_autovacuum_scores</primary></indexterm></entry>
+      <entry>
+       One row for each table in the current database, showing the current
+       autovacuum scores for that specific table.  See
+       <link linkend="monitoring-pg-stat-autovacuum-scores-view">
+       <structname>pg_stat_autovacuum_scores</structname></link> for details.
+      </entry>
+     </row>
+
      <row>
       <entry><structname>pg_stat_all_indexes</structname><indexterm><primary>pg_stat_all_indexes</primary></indexterm></entry>
       <entry>
@@ -4502,6 +4512,139 @@ description | Waiting for a newly initialized WAL file to reach durable storage
 
  </sect2>
 
+ <sect2 id="monitoring-pg-stat-autovacuum-scores-view">
+  <title><structname>pg_stat_autovacuum_scores</structname></title>
+
+  <indexterm>
+   <primary>pg_stat_autovacuum_scores</primary>
+  </indexterm>
+
+  <para>
+   The <structname>pg_stat_autovacuum_scores</structname> view will contain one
+   row for each table in the current database (including TOAST tables), showing
+   the current autovacuum scores for that specific table.  Tables deemed
+   eligible for processing are prioritized based on their
+   <structfield>score</structfield>, with higher scores indicating higher
+   priority.  See <xref linkend="autovacuum-priority"/> for more information.
+  </para>
+
+  <table id="pg-stat-autovacuum-scores-view" xreflabel="pg_stat_autovacuum_scores">
+   <title><structname>pg_stat_autovacuum_scores</structname> View</title>
+   <tgroup cols="1">
+    <thead>
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       Column Type
+      </para>
+      <para>
+       Description
+      </para></entry>
+     </row>
+    </thead>
+
+    <tbody>
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>relid</structfield> <type>oid</type>
+      </para>
+      <para>
+       Oid of the table.
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>schemaname</structfield> <type>name</type>
+      </para>
+      <para>
+       Name of the schema that the table is in.
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>relname</structfield> <type>name</type>
+      </para>
+      <para>
+       Name of the table.
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>score</structfield> <type>double precision</type>
+      </para>
+      <para>
+       Maximum value of all component scores.  This is the value that
+       autovacuum uses to sort the list of tables to process.  When the
+       "weight" parameters are set to their default values of
+       <literal>1.0</literal>, scores greater than or equal to
+       <literal>1.0</literal> indicate the table will be processed (unless
+       autovacuum is disabled and neither <literal>xid_score</literal> nor
+       <literal>mxid_score</literal> are greater than or equal to
+       <literal>1.0</literal>).
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>xid_score</structfield> <type>double precision</type>
+      </para>
+      <para>
+       Transaction ID age component score.  Scores greater than or equal to
+       <xref linkend="guc-autovacuum-freeze-score-weight"/> indicate the table
+       will be vacuumed.
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>mxid_score</structfield> <type>double precision</type>
+      </para>
+      <para>
+       Multixact ID age component score.  Scores greater than or equal to
+       <xref linkend="guc-autovacuum-multixact-freeze-score-weight"/> indicate
+       the table will be vacuumed.
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>vacuum_score</structfield> <type>double precision</type>
+      </para>
+      <para>
+       Vacuum component score.  Scores greater than or equal to
+       <xref linkend="guc-autovacuum-vacuum-score-weight"/> indicate the table
+       will be vacuumed (unless autovacuum is disabled).
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>vacuum_insert_score</structfield> <type>double precision</type>
+      </para>
+      <para>
+       Vacuum insert component score.  Scores greater than or equal to
+       <xref linkend="guc-autovacuum-vacuum-insert-score-weight"/> indicate the
+       table will be vacuumed (unless autovacuum is disabled).
+      </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+       <structfield>analyze_score</structfield> <type>double precision</type>
+      </para>
+      <para>
+       Analyze component score.  Scores greater than or equal to
+       <xref linkend="guc-autovacuum-analyze-score-weight"/> indicate the table
+       will be analyzed (unless autovacuum is disabled).
+      </para></entry>
+     </row>
+    </tbody>
+   </tgroup>
+  </table>
+ </sect2>
+
  <sect2 id="monitoring-pg-stat-all-indexes-view">
   <title><structname>pg_stat_all_indexes</structname></title>
 
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index eba25aa3e4d..5c2f2977965 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -795,6 +795,21 @@ CREATE VIEW pg_stat_xact_user_tables AS
     WHERE schemaname NOT IN ('pg_catalog', 'information_schema') AND
           schemaname !~ '^pg_toast';
 
+CREATE VIEW pg_stat_autovacuum_scores AS
+    SELECT
+        s.oid AS relid,
+        n.nspname AS schemaname,
+        c.relname AS relname,
+        s.score,
+        s.xid_score,
+        s.mxid_score,
+        s.vacuum_score,
+        s.vacuum_insert_score,
+        s.analyze_score
+    FROM pg_stat_get_autovacuum_scores() s
+    JOIN pg_class c on c.oid = s.oid
+    LEFT JOIN pg_namespace n ON n.oid = c.relnamespace;
+
 CREATE VIEW pg_statio_all_tables AS
     SELECT
             C.oid AS relid,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 1be1ba8a25f..c6c601dd3ad 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -80,6 +80,7 @@
 #include "catalog/pg_namespace.h"
 #include "commands/vacuum.h"
 #include "common/int.h"
+#include "funcapi.h"
 #include "lib/ilist.h"
 #include "libpq/pqsignal.h"
 #include "miscadmin.h"
@@ -111,6 +112,7 @@
 #include "utils/syscache.h"
 #include "utils/timeout.h"
 #include "utils/timestamp.h"
+#include "utils/tuplestore.h"
 #include "utils/wait_event.h"

@@ -3623,3 +3625,71 @@ check_av_worker_gucs(void)
 				 errdetail("The server will only start up to \"autovacuum_worker_slots\" (%d) autovacuum workers at a given time.",
 						   autovacuum_worker_slots)));
 }
+
+/*
+ * pg_stat_get_autovacuum_scores
+ *
+ * Returns current autovacuum scores for all relevant tables in the current
+ * database.
+ */
+Datum
+pg_stat_get_autovacuum_scores(PG_FUNCTION_ARGS)
+{
+	int			effective_multixact_freeze_max_age;
+	Relation	rel;
+	TableScanDesc scan;
+	HeapTuple	tup;
+	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
+
+	InitMaterializedSRF(fcinfo, 0);
+
+	/* some prerequisite initialization */
+	effective_multixact_freeze_max_age = MultiXactMemberFreezeThreshold();
+	recentXid = ReadNextTransactionId();
+	recentMulti = ReadNextMultiXactId();
+
+	/* scan pg_class */
+	rel = table_open(RelationRelationId, AccessShareLock);
+	scan = table_beginscan_catalog(rel, 0, NULL);
+	while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
+	{
+		Form_pg_class form = (Form_pg_class) GETSTRUCT(tup);
+		AutoVacOpts *avopts;
+		bool		dovacuum;
+		bool		doanalyze;
+		bool		wraparound;
+		AutoVacuumScores scores;
+		Datum		vals[7];
+		bool		nulls[7] = {false};
+
+		/* skip ineligible entries */
+		if (form->relkind != RELKIND_RELATION &&
+			form->relkind != RELKIND_MATVIEW &&
+			form->relkind != RELKIND_TOASTVALUE)
+			continue;
+		if (form->relpersistence == RELPERSISTENCE_TEMP)
+			continue;
+
+		avopts = extract_autovac_opts(tup, RelationGetDescr(rel));
+		relation_needs_vacanalyze(form->oid, avopts, form,
+								  effective_multixact_freeze_max_age, 0,
+								  &dovacuum, &doanalyze, &wraparound,
+								  &scores);
+		if (avopts)
+			pfree(avopts);
+
+		vals[0] = ObjectIdGetDatum(form->oid);
+		vals[1] = Float8GetDatum(scores.max);
+		vals[2] = Float8GetDatum(scores.xid);
+		vals[3] = Float8GetDatum(scores.mxid);
+		vals[4] = Float8GetDatum(scores.vac);
+		vals[5] = Float8GetDatum(scores.vac_ins);
+		vals[6] = Float8GetDatum(scores.anl);
+
+		tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, vals, nulls);
+	}
+	table_endscan(scan);
+	table_close(rel, AccessShareLock);
+
+	return (Datum) 0;
+}
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index bd177aebfcb..0de3bb52eb2 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5667,6 +5667,13 @@
   proname => 'pg_stat_get_total_autoanalyze_time', provolatile => 's',
   proparallel => 'r', prorettype => 'float8', proargtypes => 'oid',
   prosrc => 'pg_stat_get_total_autoanalyze_time' },
+{ oid => '8409', descr => 'autovacuum scores',
+  proname => 'pg_stat_get_autovacuum_scores', prorows => '100', proretset => 't',
+  provolatile => 'v', proparallel => 'u', prorettype => 'record', proargtypes => '',
+  proallargtypes => '{oid,float8,float8,float8,float8,float8,float8}',
+  proargmodes => '{o,o,o,o,o,o,o}',
+  proargnames => '{oid,score,xid_score,mxid_score,vacuum_score,vacuum_insert_score,analyze_score}',
+  prosrc => 'pg_stat_get_autovacuum_scores' },
 { oid => '1936', descr => 'statistics: currently active backend IDs',
   proname => 'pg_stat_get_backend_idset', prorows => '100', proretset => 't',
   provolatile => 's', proparallel => 'r', prorettype => 'int4',
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 81a73c426d2..b167e8d3cab 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1860,6 +1860,18 @@ pg_stat_archiver| SELECT archived_count,
     last_failed_time,
     stats_reset
    FROM pg_stat_get_archiver() s(archived_count, last_archived_wal, last_archived_time, failed_count, last_failed_wal, last_failed_time, stats_reset);
+pg_stat_autovacuum_scores| SELECT s.oid AS relid,
+    n.nspname AS schemaname,
+    c.relname,
+    s.score,
+    s.xid_score,
+    s.mxid_score,
+    s.vacuum_score,
+    s.vacuum_insert_score,
+    s.analyze_score
+   FROM ((pg_stat_get_autovacuum_scores() s(oid, score, xid_score, mxid_score, vacuum_score, vacuum_insert_score, analyze_score)
+     JOIN pg_class c ON ((c.oid = s.oid)))
+     LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace)));
 pg_stat_bgwriter| SELECT pg_stat_get_bgwriter_buf_written_clean() AS buffers_clean,
     pg_stat_get_bgwriter_maxwritten_clean() AS maxwritten_clean,
     pg_stat_get_buf_alloc() AS buffers_alloc,
-- 
2.50.1 (Apple Git-155)

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