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Add relallfrozen to pg_class

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Add relallfrozen, an estimate of the number of pages marked all-frozen
in the visibility map.

pg_class already has relallvisible, an estimate of the number of pages
in the relation marked all-visible in the visibility map. This is used
primarily for planning.

relallfrozen, together with relallvisible, is useful for estimating the
outstanding number of all-visible but not all-frozen pages in the
relation for the purposes of scheduling manual VACUUMs and tuning vacuum
freeze parameters.

A future commit will use relallfrozen to trigger more frequent vacuums
on insert-focused workloads with significant volume of frozen data.

Bump catalog version

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Robert Treat <rob@xzilla.net>
Reviewed-by: Corey Huinker <corey.huinker@gmail.com>
Reviewed-by: Greg Sabino Mullane <htamfids@gmail.com>
Discussion: https://postgr.es/m/flat/CAAKRu_aj-P7YyBz_cPNwztz6ohP%2BvWis%3Diz3YcomkB3NpYA--w%40mail.gmail.com
This commit is contained in:
Melanie Plageman
2025-03-03 11:18:05 -05:00
parent 8492feb98f
commit 99f8f3fbbc
14 changed files with 190 additions and 70 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/backend/commands/analyze.c
View File

@@ -630,12 +630,11 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
*/
if (!inh)
{
BlockNumber relallvisible;
BlockNumber relallvisible = 0;
BlockNumber relallfrozen = 0;
if (RELKIND_HAS_STORAGE(onerel->rd_rel->relkind))
visibilitymap_count(onerel, &relallvisible, NULL);
else
relallvisible = 0;
visibilitymap_count(onerel, &relallvisible, &relallfrozen);
/*
* Update pg_class for table relation. CCI first, in case acquirefunc
@@ -646,6 +645,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
relpages,
totalrows,
relallvisible,
relallfrozen,
hasindex,
InvalidTransactionId,
InvalidMultiXactId,
@@ -662,7 +662,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
vac_update_relstats(Irel[ind],
RelationGetNumberOfBlocks(Irel[ind]),
totalindexrows,
0,
0, 0,
false,
InvalidTransactionId,
InvalidMultiXactId,
@@ -678,7 +678,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
*/
CommandCounterIncrement();
vac_update_relstats(onerel, -1, totalrows,
0, hasindex, InvalidTransactionId,
0, 0, hasindex, InvalidTransactionId,
InvalidMultiXactId,
NULL, NULL,
in_outer_xact);

5
src/backend/commands/cluster.c
View File

@@ -1226,6 +1226,7 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class,
int32 swap_pages;
float4 swap_tuples;
int32 swap_allvisible;
int32 swap_allfrozen;
swap_pages = relform1->relpages;
relform1->relpages = relform2->relpages;
@@ -1238,6 +1239,10 @@ swap_relation_files(Oid r1, Oid r2, bool target_is_pg_class,
swap_allvisible = relform1->relallvisible;
relform1->relallvisible = relform2->relallvisible;
relform2->relallvisible = swap_allvisible;
swap_allfrozen = relform1->relallfrozen;
relform1->relallfrozen = relform2->relallfrozen;
relform2->relallfrozen = swap_allfrozen;
}
/*

6
src/backend/commands/vacuum.c
View File

@@ -1427,6 +1427,7 @@ void
vac_update_relstats(Relation relation,
BlockNumber num_pages, double num_tuples,
BlockNumber num_all_visible_pages,
BlockNumber num_all_frozen_pages,
bool hasindex, TransactionId frozenxid,
MultiXactId minmulti,
bool *frozenxid_updated, bool *minmulti_updated,
@@ -1476,6 +1477,11 @@ vac_update_relstats(Relation relation,
pgcform->relallvisible = (int32) num_all_visible_pages;
dirty = true;
}
if (pgcform->relallfrozen != (int32) num_all_frozen_pages)
{
pgcform->relallfrozen = (int32) num_all_frozen_pages;
dirty = true;
}
/* Apply DDL updates, but not inside an outer transaction (see above) */