From: Heikki Linnakangas <heikki@enterprisedb.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-hackers@postgresql.org
Cc: Robert Treat <xzilla@users.sourceforge.net>
Cc: Peter Eisentraut <peter_e@gmx.net>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: Andreas Pflug <pgadmin@pse-consulting.de>
Cc: Decibel! <decibel@decibel.org>
Subject: Re: Overhauling GUCS
Date: Wed, 11 Jun 2008 09:52:03 +0300
Message-ID: <484F7613.5070202@enterprisedb.com> (raw)
In-Reply-To: <21875.1213122184@sss.pgh.pa.us>
References: <48409D1E.3070208@agliodbs.com>
<200806061624.29105.xzilla@users.sourceforge.net>
<200806100937.38124.josh@agliodbs.com>
<200806100949.17918.josh@agliodbs.com>
<21875.1213122184@sss.pgh.pa.us>
Tom Lane wrote:
> Josh Berkus <josh@agliodbs.com> writes:
>> Oh, and wal_buffers, the default for which we should just change if it
>> weren't for SHMMAX.
>
> Uh, why? On a workload of mostly small transactions, what value is
> there in lots of wal_buffers?
None. But there's also little to no harm in having a higher setting; at
worst you waste a few megabytes of memory. Besides, most databases are
initialized from some outside source in the beginning, and data loading
does benefit from a higher wal_buffers setting.
Ideally, of course, there would be no wal_buffers setting, and WAL
buffers would be allocated from shared_buffers pool on demand...
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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To: pgsql-hackers@postgresql.org
Cc: heikki@enterprisedb.com, tgl@sss.pgh.pa.us, josh@agliodbs.com, xzilla@users.sourceforge.net, peter_e@gmx.net, gsmith@gregsmith.com, pgadmin@pse-consulting.de, decibel@decibel.org
Subject: Re: Overhauling GUCS
In-Reply-To: <484F7613.5070202@enterprisedb.com>
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