postgres.git / summary / log / commit / refs
commit 3f134ce7001b8d526b0bb0b8362a24d0966bb732
Author: Michael Paquier <michael@paquier.xyz>
Date: Thu Aug 21 04:25:58 2025 +0000
First released in: 13.23, 14.20, 15.15, 16.11, 17.7, 18.0
doc: Improve description of wal_compression
The description of this GUC provides a list of the situations where
full-page writes are generated. However, it is not completely exact,
mentioning only the cases where full_page_writes=on or base backups. It
is possible to generate full-page writes in more situations than these
two, making the description confusing as it implies that no other cases
exist.
The description is slightly reworded to take into account that other
cases are possible, without mentioning them directly to minimize the
maintenance burden should FPWs be generated in more contexts in the
future.
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.com
Backpatch-through: 13
doc/src/sgml/config.sgml | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index a77b6b43fb0..76078335438 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2981,8 +2981,9 @@ include_dir 'conf.d'
<listitem>
<para>
When this parameter is <literal>on</literal>, the <productname>PostgreSQL</productname>
- server compresses a full page image written to WAL when
- <xref linkend="guc-full-page-writes"/> is on or during a base backup.
+ server compresses a full page image written to WAL (e.g. when
+ <xref linkend="guc-full-page-writes"/> is on, during a base backup,
+ etc.).
A compressed page image will be decompressed during WAL replay.
The default value is <literal>off</literal>.
Only superusers can change this setting.
[parent: 8ed079cad824]