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

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
This commit is contained in:
Fujii Masao 2020-07-06 14:27:09 +09:00
parent aa38434824
commit 321fa6a4a2
1 changed files with 3 additions and 0 deletions
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3
doc/src/sgml/pgstatstatements.sgml
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@ -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>