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Commit8594444

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doc: Improve description of wal_compression
The description of this GUC provides a list of the situations wherefull-page writes are generated. However, it is not completely exact,mentioning only the cases where full_page_writes=on or base backups. Itis possible to generate full-page writes in more situations than thesetwo, making the description confusing as it implies that no other casesexist.The description is slightly reworded to take into account that othercases are possible, without mentioning them directly to minimize themaintenance burden should FPWs be generated in more contexts in thefuture.Author: Jingtang Zhang <mrdrivingduck@gmail.com>Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com>Discussion:https://postgr.es/m/CAPsk3_CtAYa_fy4p6=x7qtoutrdKvg1kGk46D5fsE=sMt2546g@mail.gmail.comBackpatch-through: 13
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‎doc/src/sgml/config.sgml‎

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@@ -3399,8 +3399,9 @@ include_dir 'conf.d'
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This parameter enables compression of WAL using the specified
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compression method.
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When enabled, the <productname>PostgreSQL</productname>
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server compresses full page images written to WAL when
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<xref linkend="guc-full-page-writes"/> is on or during a base backup.
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server compresses full page images written to WAL (e.g. when
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<xref linkend="guc-full-page-writes"/> is on, during a base backup,
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etc.).
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A compressed page image will be decompressed during WAL replay.
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The supported methods are <literal>pglz</literal>,
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<literal>lz4</literal> (if <productname>PostgreSQL</productname>

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