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Count updates that move row to a new page.

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Add pgstat counter to track row updates that result in the successor
version going to a new heap page, leaving behind an original version
whose t_ctid points to the new version.  The current count is shown by
the n_tup_newpage_upd column of each of the pg_stat_*_tables views.

The new n_tup_newpage_upd column complements the existing n_tup_hot_upd
and n_tup_upd columns.  Tables that have high n_tup_newpage_upd values
(relative to n_tup_upd) are good candidates for tuning heap fillfactor.

Corey Huinker, with small tweaks by me.

Author: Corey Huinker <corey.huinker@gmail.com>
Reviewed-By: Peter Geoghegan <pg@bowt.ie>
Reviewed-By: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CADkLM=ded21M9iZ36hHm-vj2rE2d=zcKpUQMds__Xm2pxLfHKA@mail.gmail.com
This commit is contained in:
Peter Geoghegan
2023-03-23 11:16:17 -07:00
parent 3b50275b12
commit ae4fdde135
9 changed files with 80 additions and 16 deletions
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2
src/backend/access/heap/heapam.c
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@@ -3803,7 +3803,7 @@ l2:
if (have_tuple_lock)
UnlockTupleTuplock(relation, &(oldtup.t_self), *lockmode);
pgstat_count_heap_update(relation, use_hot_update);
pgstat_count_heap_update(relation, use_hot_update, newbuf != buffer);
/*
* If heaptup is a private copy, release it. Don't forget to copy t_self