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| author | Peter Geoghegan <pg@bowt.ie> | 2023-03-23 11:16:17 -0700 |
|---|---|---|
| committer | Peter Geoghegan <pg@bowt.ie> | 2023-03-23 11:16:17 -0700 |
| commit | ae4fdde1352fa6b2c9123e91435efafc78c370a0 (patch) | |
| tree | 2f0bc32e55b16114a24d14180231a117be526e8b /src/backend/utils/adt/pgstatfuncs.c | |
| parent | 3b50275b12950280fb07193e24a4f400ed8a9fef (diff) | |
| download | postgresql-ae4fdde1352fa6b2c9123e91435efafc78c370a0.tar.gz postgresql-ae4fdde1352fa6b2c9123e91435efafc78c370a0.zip | |
Count updates that move row to a new page.
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
Diffstat (limited to 'src/backend/utils/adt/pgstatfuncs.c')
| -rw-r--r-- | src/backend/utils/adt/pgstatfuncs.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c index 35c6d465553..56119737c89 100644 --- a/src/backend/utils/adt/pgstatfuncs.c +++ b/src/backend/utils/adt/pgstatfuncs.c @@ -92,6 +92,9 @@ PG_STAT_GET_RELENTRY_INT64(tuples_fetched) /* pg_stat_get_tuples_hot_updated */ PG_STAT_GET_RELENTRY_INT64(tuples_hot_updated) +/* pg_stat_get_tuples_newpage_updated */ +PG_STAT_GET_RELENTRY_INT64(tuples_newpage_updated) + /* pg_stat_get_tuples_inserted */ PG_STAT_GET_RELENTRY_INT64(tuples_inserted) @@ -1619,6 +1622,21 @@ pg_stat_get_xact_tuples_hot_updated(PG_FUNCTION_ARGS) } Datum +pg_stat_get_xact_tuples_newpage_updated(PG_FUNCTION_ARGS) +{ + Oid relid = PG_GETARG_OID(0); + int64 result; + PgStat_TableStatus *tabentry; + + if ((tabentry = find_tabstat_entry(relid)) == NULL) + result = 0; + else + result = (int64) (tabentry->t_counts.t_tuples_newpage_updated); + + PG_RETURN_INT64(result); +} + +Datum pg_stat_get_xact_blocks_fetched(PG_FUNCTION_ARGS) { Oid relid = PG_GETARG_OID(0); |