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| author | Melanie Plageman | 2025-03-03 16:18:05 +0000 |
|---|---|---|
| committer | Melanie Plageman | 2025-03-03 16:18:05 +0000 |
| commit | 99f8f3fbbc8f743290844e8c676d39dad11c5d5d (patch) | |
| tree | bfa0507e88c83d28053a7e8beb36d8d61b43b871 /src/backend/utils/cache | |
| parent | 8492feb98f6df3f0f03e84ed56f0d1cbb2ac514c (diff) | |
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/utils/cache')
| -rw-r--r-- | src/backend/utils/cache/relcache.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c index 398114373e9..d1ae761b3f6 100644 --- a/src/backend/utils/cache/relcache.c +++ b/src/backend/utils/cache/relcache.c @@ -1928,6 +1928,7 @@ formrdesc(const char *relationName, Oid relationReltype, relation->rd_rel->relpages = 0; relation->rd_rel->reltuples = -1; relation->rd_rel->relallvisible = 0; + relation->rd_rel->relallfrozen = 0; relation->rd_rel->relkind = RELKIND_RELATION; relation->rd_rel->relnatts = (int16) natts; @@ -3885,6 +3886,7 @@ RelationSetNewRelfilenumber(Relation relation, char persistence) classform->relpages = 0; /* it's empty until further notice */ classform->reltuples = -1; classform->relallvisible = 0; + classform->relallfrozen = 0; } classform->relfrozenxid = freezeXid; classform->relminmxid = minmulti; |