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Re: Optimize slow query

From: Cédric Villemain <cedric(dot)villemain(at)dalibo(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Cc: "Tyler Durden" <tylersticky(at)gmail(dot)com>
Subject: Re: Optimize slow query
Date: 2007-06-13 11:47:23
Message-ID: 200706131350.01695.cedric.villemain@dalibo.com (view raw or flat)
Thread:
Lists: pgsql-performance
Le mercredi 13 juin 2007, Tyler Durden a écrit :
> Hi,
> I've a table with 300 000 records and I'm trying to do a search:
>
> SELECT * FROM addresses WHERE address ILIKE '%Jean Paul%' AND
> (l_pc='4250' or r_pc='4250') AND (l_struc='O' or r_struc='O') AND
> (prenm ILIKE 'Street')
>
> It performs in 2 seconds in a dual Xeon 2.4mhz with 2Gb of RAM.
> I'm using Postgresql 8.1 on ubuntu.
> I've indexes on l_pc, r_pc, l_struc,r_struc and prenm (all btrees)
> What I'm doing wrong to have such a slow query?
Could you add 'explain analyze' to your post ? 
And how much content have the text fields ? (isn't tsearch2 an option for 
you ?)
>
> Thanks,
> Nuno Mariz
>
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Cédric Villemain
Administrateur de Base de Données
Cel: +33 (0)6 74 15 56 53
http://dalibo.com - http://dalibo.org

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