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Diffstat (limited to 'doc/src/sgml/config.sgml')
| -rw-r--r-- | doc/src/sgml/config.sgml | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 0ad838345aa..07214bfd76a 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -2282,6 +2282,30 @@ include_dir 'conf.d' </listitem> </varlistentry> + <varlistentry id="guc-wal-compression" xreflabel="wal_compression"> + <term><varname>wal_compression</varname> (<type>boolean</type>) + <indexterm> + <primary><varname>wal_compression</> configuration parameter</primary> + </indexterm> + </term> + <listitem> + <para> + When this parameter is <literal>on</>, the <productname>PostgreSQL</> + server compresses a full page image written to WAL when + <xref linkend="guc-full-page-writes"> is on or during a base backup. + A compressed page image will be decompressed during WAL replay. + The default value is <literal>off</>. + </para> + + <para> + Turning this parameter on can reduce the WAL volume without + increasing the risk of unrecoverable data corruption, + but at the cost of some extra CPU spent on the compression during + WAL logging and on the decompression during WAL replay. + </para> + </listitem> + </varlistentry> + <varlistentry id="guc-wal-buffers" xreflabel="wal_buffers"> <term><varname>wal_buffers</varname> (<type>integer</type>) <indexterm> |