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Re: 30-70 seconds query...

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "alexandre :: aldeia digital" <alepaes(at)aldeiadigital(dot)com(dot)br>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: 30-70 seconds query...
Date: 2003-03-31 22:58:32
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
I said:
> PG 7.4 will be better prepared to handle this sort of query, but I don't
> think it will realize that the T1/T2 left join could be reduced to a
> plain join given these conditions

I take that back --- actually, the algorithm used in CVS tip *does*
deduce that all these left joins can be plain joins.

Don't suppose you'd like to experiment with a current snapshot to see
how well it does for you?

			regards, tom lane

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