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Briefly document in two places that pg_dump and pg_dumpall cannot be

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used for continuous archiving.
This commit is contained in:
Bruce Momjian 2010-02-22 17:15:10 +00:00
parent 9dd6c4686b
commit dd1486ccd4
1 changed files with 14 additions and 2 deletions
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16
doc/src/sgml/backup.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.143 2010/02/22 11:47:30 heikki Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/backup.sgml,v 2.144 2010/02/22 17:15:10 momjian Exp $ -->
<chapter id="backup"> <chapter id="backup">
<title>Backup and Restore</title> <title>Backup and Restore</title>
@ -484,6 +484,16 @@ tar -cf backup.tar /usr/local/pgsql/data
</itemizedlist> </itemizedlist>
</para> </para>
<note>
<para>
<application>pg_dump</application> and
<application>pg_dumpall</application> do not produce file-system-level
backups and cannot be used as part of a continuous-archiving solution.
Such dumps are <emphasis>logical</> and do not contain enough
information to used by WAL reply.
</para>
</note>
<para> <para>
As with the plain file-system-backup technique, this method can only As with the plain file-system-backup technique, this method can only
support restoration of an entire database cluster, not a subset. support restoration of an entire database cluster, not a subset.
@ -744,7 +754,9 @@ SELECT pg_start_backup('label', true);
<listitem> <listitem>
<para> <para>
Perform the backup, using any convenient file-system-backup tool Perform the backup, using any convenient file-system-backup tool
such as <application>tar</> or <application>cpio</>. It is neither such as <application>tar</> or <application>cpio</> (not
<application>pg_dump</application> or
<application>pg_dumpall</application>). It is neither
necessary nor desirable to stop normal operation of the database necessary nor desirable to stop normal operation of the database
while you do this. while you do this.
</para> </para>