From: Josh Berkus <josh@agliodbs.com>
To: Oleg Lebedev <oleg.lebedev@waterford.org>
To: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: slow query
Date: Sun, 23 Feb 2003 12:52:30 -0800
Message-ID: <200302231252.30681.josh@agliodbs.com> (raw)
In-Reply-To: <993DBE5B4D02194382EC8DF8554A5273033583@postoffice.waterford.org>
References: <993DBE5B4D02194382EC8DF8554A5273033583@postoffice.waterford.org>
Oleg,
> I VACUUM ANALYZED both databases and made sure they have same indexes on
> the tables.
Have you VACUUM FULL the main database? And how about REINDEX?
> Here is the query:
> SELECT * FROM media m, speccharacter c
> WHERE m.mediatype IN (SELECT objectid FROM mediatype WHERE
> medianame='Audio')
The above should use an EXISTS clause, not IN, unless you are absolutely sure
that the subquery will never return more than 12 rows.
--
Josh Berkus
Aglio Database Solutions
San Francisco
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To: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com, oleg.lebedev@waterford.org
Subject: Re: slow query
In-Reply-To: <200302231252.30681.josh@agliodbs.com>
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