Обсуждение: Optimize slow query

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?

Thanks,
Nuno Mariz

On 6/13/07, Tyler Durden <tylersticky@gmail.com> wrote:
> 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?
>
> Thanks,
> Nuno Mariz
>

My bad!
Sorry, I've missed an index on l_struc and r_struc.

Thanks, anyway.

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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