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Adjust paragraph about monitoring streaming replication, now that we have

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standby_keep_segments.
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Heikki Linnakangas 2010-04-12 10:01:04 +00:00
parent e57cd7f0a1
commit e76b4e0ddb
1 changed files with 4 additions and 8 deletions
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doc/src/sgml/high-availability.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/high-availability.sgml,v 1.59 2010/04/12 09:52:29 heikki Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/high-availability.sgml,v 1.60 2010/04/12 10:01:04 heikki Exp $ -->
<chapter id="high-availability"> <chapter id="high-availability">
<title>High Availability, Load Balancing, and Replication</title> <title>High Availability, Load Balancing, and Replication</title>
@ -827,13 +827,9 @@ primary_conninfo = 'host=192.168.1.50 port=5432 user=foo password=foopass'
<sect3 id="streaming-replication-monitoring"> <sect3 id="streaming-replication-monitoring">
<title>Monitoring</title> <title>Monitoring</title>
<para> <para>
The WAL files required for the standby's recovery are not deleted from An important health indicator of streaming replication is the amount
the <filename>pg_xlog</> directory on the primary while the standby is of WAL records generated in the primary, but not yet applied in the
connected. If the standby lags far behind the primary, many WAL files standby. You can calculate this lag by comparing the current WAL write
will accumulate in there, and can fill up the disk. It is therefore
important to monitor the lag to ensure the health of the standby and
to avoid disk full situations in the primary.
You can calculate the lag by comparing the current WAL write
location on the primary with the last WAL location received by the location on the primary with the last WAL location received by the
standby. They can be retrieved using standby. They can be retrieved using
<function>pg_current_xlog_location</> on the primary and the <function>pg_current_xlog_location</> on the primary and the