Re: [GENERAL] Fast join

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: Leon <leon(at)udmnet(dot)ru>
Cc: "'pgsql-general(at)hub(dot)org'" <pgsql-general(at)hub(dot)org>
Subject: Re: [GENERAL] Fast join
Date: 1999-06-29 15:09:18
Message-ID: 199906291509.LAA02017@candle.pha.pa.us
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> > Also, if a join does most of the table, it is faster do not use indexes,
> > and just sort on the backend.
> >
>
> The problem is - when you want just a small part of the table(s) and
> you have indices to facilitate qualifications, Postgres doesn't
> use 'em ! This is a question of Life and Death - i.e. to use or
> not to use Postgres.

As I remember, your qualification was x > 10. That may not be
restrictive enough to make an index faster.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026

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