From 99f8f3fbbc8f743290844e8c676d39dad11c5d5d Mon Sep 17 00:00:00 2001 From: Melanie Plageman Date: Mon, 3 Mar 2025 11:18:05 -0500 Subject: 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 Reviewed-by: Nathan Bossart Reviewed-by: Robert Treat Reviewed-by: Corey Huinker Reviewed-by: Greg Sabino Mullane Discussion: https://postgr.es/m/flat/CAAKRu_aj-P7YyBz_cPNwztz6ohP%2BvWis%3Diz3YcomkB3NpYA--w%40mail.gmail.com --- src/backend/commands/cluster.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'src/backend/commands/cluster.c') 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; } /* -- cgit v1.2.3