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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/commands/cluster.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/commands/cluster.c')
| -rw-r--r-- | src/backend/commands/cluster.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c index 99193f5c886..54a08e4102e 100644 --- a/src/backend/commands/cluster.c +++ b/src/backend/commands/cluster.c @@ -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; } /* |