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Re: Comparative performance

From: Dennis Bjorklund <db(at)zigo(dot)dhs(dot)org>
To: Joe <svn(at)freedomcircle(dot)net>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Comparative performance
Date: 2005-09-29 05:38:38
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Wed, 28 Sep 2005, Joe wrote:

> Before I post the EXPLAIN and the table schema I'd appreciate
> confirmation that this list is the appropriate forum. 

It is and and useful things to show are

 * the slow query
 * EXPLAIN ANALYZE of the query
 * the output of \d for each table involved in the query
 * the output of SHOW ALL;
 * The amount of memory the machine have

The settings that are the most important to tune in postgresql.conf for
performance is in my opinion; shared_buffers, effective_cache_size and
(to a lesser extent) work_mem.

/Dennis Björklund

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Subject: Re: [PERFORM] A Better External Sort?
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