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Re: WAL log archive frequency

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Chris Jewell <c(dot)jewell(at)lancaster(dot)ac(dot)uk>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: WAL log archive frequency
Date: 2006-01-19 17:01:51
Message-ID: 17319.1137690111@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-admin
Chris Jewell <c(dot)jewell(at)lancaster(dot)ac(dot)uk> writes:
> Further to my question on PITR, I have now implemented it :-)  However,
> I was wondering about the frequency of archiving the WAL.  Does
> postgresql wait until the current WAL file has reached 16MB before
> calling the archive_command?

Yes.  The assumption is the archive_command may be too stupid to deal
with archiving the same file more than once, and/or might have
performance issues with doing that, eg, if it's writing to tape or some
kind of write-once media.

You can do something like saving the newest-by-timestamp file in the
xlog directory every minute or whatever via a cron job.  This ought to
be better integrated though ...

			regards, tom lane

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