From: Chris <dmagick@gmail.com>
To: Sue Fitt <sue@inf.ed.ac.uk>
Cc: pgsql-performance@postgresql.org
Subject: Re: setting up foreign keys
Date: Thu, 10 Aug 2006 18:15:00 +1000
Message-ID: <44DAEB04.9050306@gmail.com> (raw)
In-Reply-To: <44DAE8CF.1030107@inf.ed.ac.uk>
References: <44DAE8CF.1030107@inf.ed.ac.uk>
Sue Fitt wrote:
> Hi all,
>
> This is my first post to the performance list, I hope someone can help me.
>
> I'm setting up a table with 2 columns, both of which reference a column
> in another table:
>
> CREATE TABLE headwords_core_lexemes (
> core_id int REFERENCES headwords_core(core_id),
> lexeme_id int REFERENCES headwords_core(core_id),
> );
One problem here is both of these are referencing the same column ;) I'm
sure that's a typo.
It sounds like you have something blocking or locking the other table.
Check pg_locks (I think it is), 13,000 rows shouldn't take *that* long.
Make sure there is an index on headwords_core(core_id) and whatever the
other column should be.
Foreign keys have to check the other table so without those indexes, it
will be slow(er).
--
Postgresql & php tutorials
http://www.designmagick.com/
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To: pgsql-performance@postgresql.org
Cc: dmagick@gmail.com, sue@inf.ed.ac.uk
Subject: Re: setting up foreign keys
In-Reply-To: <44DAEB04.9050306@gmail.com>
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