Re: Query performance question on a large table

Hi Tom,
thank you, I'll upgrade as soon as I can. Anyway I've already planned to do
so for a while.
I'll keep in mind your remarks concerning the DISTINCT clause too.

Bye and Best Regards,
-- Csaba

> -----Original Message-----
> From: pgsql-general-owner(at)postgresql(dot)org
> [mailto:pgsql-general-owner(at)postgresql(dot)org]On Behalf Of Tom Lane
> Sent: 2004. január 6. 21:04
> To: csegyud(at)vnet(dot)hu
> Cc: Pgsql-General(at)Postgresql(dot)Org (E-mail)
> Subject: Re: [GENERAL] Query performance question on a large table
>
>
> =?iso-8859-2?Q?Egy=FCd_Csaba?= <csegyud(at)vnet(dot)hu> writes:
> > here is a sample query:
> > select mertido, fomeazon, ertektipus, mertertek from
> t_me30 where fomeazon
> > in (select distinct fomeazon from t_fome where lower(inuse)
> = 'igen') and
> > mertido like '2003-12-17%' and ertektipus in ('+MW') order
> by mertido,
> > fomeazon, ertektipus;
>
> > Ohh, I nearly forgot the config: Linux 7.1; Postgres 7.3.2;
>
> The first thing you ought to do is move to PG 7.4. "foo IN
> (SELECT ...)"
> generally works a lot better under 7.4 than prior releases.
> I'd suggest
> dropping the "DISTINCT" when using 7.4, too.
>
> regards, tom lane
>
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