git.postgresql.org Git - postgresql.git/commitdiff

git projects / postgresql.git / commitdiff

doc: Add note about possible performance overhead by enabling track_planning.

author Fujii Masao <fujii@postgresql.org>

Mon, 6 Jul 2020 05:27:09 +0000 (14:27 +0900)

committer Fujii Masao <fujii@postgresql.org>

Mon, 6 Jul 2020 05:27:09 +0000 (14:27 +0900)

Enabling pg_stat_statements.track_plaanning may incur a noticeable
performance penalty, especially when a fewer kinds of queries are executed
on many concurrent connections. This commit documents this note.

Back-patch to v13 where pg_stat_statements.track_plaanning was added.

Suggested-by: Pavel Stehule
Author: Fujii Masao
Reviewed-by: Pavel Stehule
Discussion: https://postgr.es/m/CAFj8pRC9Jxa8r5i0TNBWLb8mzuaYzEoLq3QOvip0jVpHPOLbVA@mail.gmail.com

doc/src/sgml/pgstatstatements.sgml patch | blob | blame | history

diff --git a/doc/src/sgml/pgstatstatements.sgml b/doc/src/sgml/pgstatstatements.sgml

index 430d8bf07c44798d822a95b392ed5ddcb72c3423..cf2d25b7b22fd9041ff7601eb5a60469853eea1d 100644 (file)

--- a/doc/src/sgml/pgstatstatements.sgml

+++ b/doc/src/sgml/pgstatstatements.sgml

@@ -607,6 +607,9 @@

<para>

<varname>pg_stat_statements.track_planning</varname> controls whether

planning operations and duration are tracked by the module.

+ Enabling this parameter may incur a noticeable performance penalty,

+ especially when a fewer kinds of queries are executed on many

+ concurrent connections.

The default value is <literal>off</literal>.

Only superusers can change this setting.

</para>

This is the main PostgreSQL git repository.

RSS Atom