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| author | Melanie Plageman <melanieplageman@gmail.com> | 2025-03-03 11:18:05 -0500 |
|---|---|---|
| committer | Melanie Plageman <melanieplageman@gmail.com> | 2025-03-03 11:18:05 -0500 |
| commit | 99f8f3fbbc8f743290844e8c676d39dad11c5d5d (patch) | |
| tree | bfa0507e88c83d28053a7e8beb36d8d61b43b871 /src/backend/access/heap/vacuumlazy.c | |
| parent | 8492feb98f6df3f0f03e84ed56f0d1cbb2ac514c (diff) | |
| download | postgresql-99f8f3fbbc8f743290844e8c676d39dad11c5d5d.tar.gz postgresql-99f8f3fbbc8f743290844e8c676d39dad11c5d5d.zip | |
Add relallfrozen to pg_class
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
Diffstat (limited to 'src/backend/access/heap/vacuumlazy.c')
| -rw-r--r-- | src/backend/access/heap/vacuumlazy.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c index 1af18a78a2b..3b91d02605a 100644 --- a/src/backend/access/heap/vacuumlazy.c +++ b/src/backend/access/heap/vacuumlazy.c @@ -623,7 +623,8 @@ heap_vacuum_rel(Relation rel, VacuumParams *params, minmulti_updated; BlockNumber orig_rel_pages, new_rel_pages, - new_rel_allvisible; + new_rel_allvisible, + new_rel_allfrozen; PGRUsage ru0; TimestampTz starttime = 0; PgStat_Counter startreadtime = 0, @@ -898,11 +899,19 @@ heap_vacuum_rel(Relation rel, VacuumParams *params, * pg_class.relpages to */ new_rel_pages = vacrel->rel_pages; /* After possible rel truncation */ - visibilitymap_count(rel, &new_rel_allvisible, NULL); + visibilitymap_count(rel, &new_rel_allvisible, &new_rel_allfrozen); if (new_rel_allvisible > new_rel_pages) new_rel_allvisible = new_rel_pages; /* + * An all-frozen block _must_ be all-visible. As such, clamp the count of + * all-frozen blocks to the count of all-visible blocks. This matches the + * clamping of relallvisible above. + */ + if (new_rel_allfrozen > new_rel_allvisible) + new_rel_allfrozen = new_rel_allvisible; + + /* * Now actually update rel's pg_class entry. * * In principle new_live_tuples could be -1 indicating that we (still) @@ -910,7 +919,8 @@ heap_vacuum_rel(Relation rel, VacuumParams *params, * scan every page that isn't skipped using the visibility map. */ vac_update_relstats(rel, new_rel_pages, vacrel->new_live_tuples, - new_rel_allvisible, vacrel->nindexes > 0, + new_rel_allvisible, new_rel_allfrozen, + vacrel->nindexes > 0, vacrel->NewRelfrozenXid, vacrel->NewRelminMxid, &frozenxid_updated, &minmulti_updated, false); @@ -3720,7 +3730,7 @@ update_relstats_all_indexes(LVRelState *vacrel) vac_update_relstats(indrel, istat->num_pages, istat->num_index_tuples, - 0, + 0, 0, false, InvalidTransactionId, InvalidMultiXactId, |