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Re: in-memory sorting

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Samuel Gendler <sgendler(at)ideasculptor(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: in-memory sorting
Date: 2010-08-19 06:24:55
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Lists: pgsql-performance
On Wed, Aug 18, 2010 at 11:45 PM, Samuel Gendler
<sgendler(at)ideasculptor(dot)com> wrote:
> Answered my own question.  Cranking work_mem up to 350MB revealed that
> the in-memory sort requires more memory than the disk sort.

Note that unless you run VERY few client connections, it's usually
better to leave work_mem somewhere in the 1 to 32Meg range and have
the connection or user or database that needs 350Meg be set there.


set work_mem='512MB';
<execute query


alter user memoryhog set work_mem='512MB';


alter database memhogdb set work_mem='512MB';

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