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 |
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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
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