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Document how pglesslog can be used to reduce the storage requirements of PITR.

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Bruce Momjian 2009-01-13 00:54:11 +00:00
parent 8ebe1e356c
commit afe8ac2078
1 changed files with 18 additions and 1 deletions
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19
doc/src/sgml/backup.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.121 2008/11/09 17:51:15 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.122 2009/01/13 00:54:11 momjian Exp $ -->
<chapter id="backup">
<title>Backup and Restore</title>
@ -1337,6 +1337,23 @@ tar -rf /var/lib/pgsql/backup.tar /var/lib/pgsql/archive/
WAL files are part of the same <application>tar</> file.
Please remember to add error handling to your backup scripts.
</para>
<para>
If archive storage size is a concern, use <application>pg_compresslog</>,
<ulink url="http://pglesslog.projects.postgresql.org"></ulink>, to
remove unnecessary <xref linkend="guc-full-page-writes"> and trailing
space from the WAL files. You can then use
<application>gzip</application> to further compress the output of
<application>pg_compresslog</>:
<programlisting>
archive_command = 'pg_compresslog %p - | gzip &gt; /var/lib/pgsql/archive/%f'
</programlisting>
You will then need to use <application>gunzip</> and
<application>pg_decompresslog</> during recovery:
<programlisting>
restore_command = 'gunzip &lt; /mnt/server/archivedir/%f | pg_decompresslog - %p'
</programlisting>
</para>
</sect3>
<sect3 id="backup-scripts">