From: Tom Lane <tgl@sss.pgh.pa.us>
To: Marc G. Fournier <scrappy@hub.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: How do FKs work?
Date: Sat, 09 Oct 2004 20:23:53 -0400
Message-ID: <6093.1097367833@sss.pgh.pa.us> (raw)
In-Reply-To: <20041009145332.D54093@ganymede.hub.org>
References: <20041009145332.D54093@ganymede.hub.org>
"Marc G. Fournier" <scrappy@hub.org> writes:
> Have a table with two FKs on it ... 2 different fields in the table point
> to the same field in another table ...
> When I do an 'EXPLAIN ANALYZE DELETE FROM table WHERE field = #;', it
> never comes back ... or, at lesat, takes a *very* long time ...
Do you have indexes on the referencing columns? Are they exactly the
same datatype as the referenced column? You can get really awful plans
for the FK-checking queries if not.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, scrappy@hub.org
Subject: Re: How do FKs work?
In-Reply-To: <6093.1097367833@sss.pgh.pa.us>
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