From: Josh Berkus <josh@agliodbs.com>
To: paul@oxton.com
Cc: pgsql-performance@postgresql.org
Subject: Re: Data Warehousing Tuning
Date: Wed, 6 Jul 2005 17:40:12 -0700
Message-ID: <200507061740.12875.josh@agliodbs.com> (raw)
In-Reply-To: <3688.217.45.209.171.1120670147.squirrel@www.gradwell.com>
References: <3688.217.45.209.171.1120670147.squirrel@www.gradwell.com>
Paul,
> Has anyone experienced real performance gains by moving the pg_xlog
> files?
Yes. Both for data load and on OLTP workloads, this increased write
performance by as much as 15%. However, you need to configure the xlog
drive correctly, you can't just move it to a new disk. Make sure the
other disk is dedicated exclusively to the xlog, set it forcedirectio, and
increase your checkpoint_segments to something like 128.
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco
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To: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com, paul@oxton.com
Subject: Re: Data Warehousing Tuning
In-Reply-To: <200507061740.12875.josh@agliodbs.com>
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