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Re: postgresql.conf

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: postgresql.conf
Date: 2003-07-30 17:19:21
Message-ID: 200307301019.21870.josh@agliodbs.com (view raw or flat)
Thread:
Lists: pgsql-performance
Scott,

> I'm guessing OLTP needs things like FSM cranked up, 
> OLAP (a for analytical) needs more shared buffers and sort memory
> Webserver might be better served just slightly higher values than default 
> but well under those of either OLTP or OLAP...

Yes. Take sort_mem for example:
OLTP_SM	1024
OLTP_LM	2048
OLAP_SM	4096
OLAP_LM	16384
WWW_SM	512
WWW_LM	1024
Workstation	1024

The basic idea is:
More RAM => more sort_mem
More concurrent queries => less sort_mem
Larger data sets => more sort_mem
Lots of grouped aggregates => more sort_mem

-- 
-Josh Berkus
 Aglio Database Solutions
 San Francisco


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