From: Dave Dutcher <dave@tridecap.com>
To: 'Rolf Østvik (HA/EXA)' <rolf.ostvik@ericsson.com>
To: pgsql-performance@postgresql.org
Subject: Re: Problem with grouping, uses Sort and GroupAggregate, HashAggregate is better(?)
Date: Sun, 14 Jan 2007 10:12:18 -0600
Message-ID: <011e01c737f6$c449c580$8300a8c0@tridecap.com> (raw)
In-Reply-To: <D7E5DB1F5F917E45AA4DF9F9F1306BEE31E1D1@esealmw111>
> -----Original Message-----
> From: pgsql-performance-owner@postgresql.org
> [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of
> Rolf Østvik (HA/EXA)
Have you tried "set enable_sort=off" with 8.1.2? I'm not sure if that will
change anything because it has to do at least one sort. Its just a lots
faster to do a hashagg + small sort than one big sort in this case. (I
wonder if there should be enable_groupagg?)
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To: pgsql-performance@postgresql.org
Cc: dave@tridecap.com, rolf.ostvik@ericsson.com
Subject: Re: Problem with grouping, uses Sort and GroupAggregate, HashAggregate is better(?)
In-Reply-To: <011e01c737f6$c449c580$8300a8c0@tridecap.com>
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