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doc: Update pg_receivexlog note 

The old note about how to use pg_receivexlog as an alternative to
archive_command was obsoleted by replication slots.
This commit is contained in:
Peter Eisentraut 2014-11-07 20:15:22 -05:00
parent 0b03e5951b
commit 552faefd68
1 changed files with 8 additions and 11 deletions
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19
doc/src/sgml/ref/pg_receivexlog.sgml
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@ -324,17 +324,14 @@ PostgreSQL documentation
<para>
When using <application>pg_receivexlog</application> instead of
<xref linkend="guc-archive-command">, the server will continue to
recycle transaction log files even if the backups are not properly
archived, since there is no command that fails. This can be worked
around by having an <xref linkend="guc-archive-command"> that fails
when the file has not been properly archived yet, for example:
<programlisting>
archive_command = 'sleep 5 &amp;&amp; test -f /mnt/server/archivedir/%f'
</programlisting>
The initial timeout is necessary because
<application>pg_receivexlog</application> works using asynchronous
replication and can therefore be slightly behind the master.
<xref linkend="guc-archive-command"> as the main WAL backup method, it is
strongly recommended to use replication slots. Otherwise, the server is
free to recycle or remove transaction log files before they are backed up,
because it does not have any information, either
from <xref linkend="guc-archive-command"> or the replication slots, about
how far the WAL stream has been archived. Note, however, that a
replication slot will fill up the server's disk space if the receiver does
not keep up with fetching the WAL data.
</para>
</refsect1>