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 13:31:52 |
Message-ID: | 199906291331.JAA20566@candle.pha.pa.us |
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Lists: | pgsql-general |
> Hello all!
>
> I assume this is a developer's list, isn't it? Because the
> address hackers-request(at)postgreSQL(dot)org mentioned in PostgreSQL FAQ
> doesn't work.
>
> Ok. Let me begin with the beginning. We are a group of developers
> of an free accounting system here in Russia. We want to use Postgres
> as our database server. It is cool, but we encountered a problem
> during preliminary tests, a problem concerning joins. The problem
> is that joins are too slow. Consider that sequence of commands
> given at the command prompt of psql (strange duplicates of NOTICEs are
> removed):
Are you using 6.5? If not, upgrade. The optimizer is much smarter in
6.5.
Also, if a join does most of the table, it is faster do not use indexes,
and just sort on the backend.
--
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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