Horton

Add mem_exceeded_count column to pg_stat_replication_slots.

Masahiko Sawada <msawada@postgresql.org>

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Commit: d3b6183dd988928dd369b4b7d641917e77f1ae4e
Author: Masahiko Sawada <msawada@postgresql.org>
Date: 2025-10-08T17:05:04Z
Releases: 19 (unreleased) 
Add mem_exceeded_count column to pg_stat_replication_slots.

This commit introduces a new column mem_exceeded_count to the
pg_stat_replication_slots view. This counter tracks how often the
memory used by logical decoding exceeds the logical_decoding_work_mem
limit. The new statistic helps users determine whether exceeding the
logical_decoding_work_mem limit is a rare occurrences or a frequent
issue, information that wasn't available through existing statistics.

Bumps catversion.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: shveta malik <shveta.malik@gmail.com>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/978D21E8-9D3B-40EA-A4B1-F87BABE7868C@yesql.se

Files

PathChange+/−
contrib/test_decoding/expected/stats.out modified +37 −34
contrib/test_decoding/sql/stats.sql modified +8 −5
doc/src/sgml/monitoring.sgml modified +11 −0
src/backend/catalog/system_views.sql modified +1 −0
src/backend/replication/logical/logical.c modified +6 −2
src/backend/replication/logical/reorderbuffer.c modified +28 −6
src/backend/utils/activity/pgstat_replslot.c modified +1 −0
src/backend/utils/adt/pgstatfuncs.c modified +11 −8
src/include/catalog/catversion.h modified +1 −1
src/include/catalog/pg_proc.dat modified +3 −3
src/include/pgstat.h modified +1 −0
src/include/replication/reorderbuffer.h modified +3 −0
src/test/regress/expected/rules.out modified +2 −1

Discussion