From: | Tatsuo Ishii <ishii(at)postgresql(dot)org> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Streaming replication document |
Date: | 2010-12-04 02:18:20 |
Message-ID: | 20101204.111820.60332142212192675.t-ishii@sraoss.co.jp |
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Lists: | pgsql-hackers |
Hi,
There is a description about streaming replication in the doc:
----------------------------------------------------------
25.2.5. Streaming Replication
:
:
If you set up a WAL archive that's accessible from the
standby, wal_keep_segments is not required as the standby can always
use the archive to catch up.
----------------------------------------------------------
I think this description is somewhat inadequate. Since recovery using
WAL archive is file based, it may cause long replication delay. I
think even if WAL archive is set up, we should set wal_keep_segments
to proper value, not 0. Recovery from WAL archive should be the last
resort, shouldn't be?
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp
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