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Commit 321fa6a

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MasaoFujiiMasaoFujii
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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
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‎doc/src/sgml/pgstatstatements.sgml

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<para>
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<varname>pg_stat_statements.track_planning</varname> controls whether
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planning operations and duration are tracked by the module.
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Enabling this parameter may incur a noticeable performance penalty,
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especially when a fewer kinds of queries are executed on many
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concurrent connections.
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The default value is <literal>off</literal>.
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Only superusers can change this setting.
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</para>

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