From: Linos <info@linos.es>
To: pgsql-performance@postgresql.org
Subject: unneeded joins on view
Date: Wed, 16 Apr 2014 17:13:24 +0200
Message-ID: <534E9E14.5000304@linos.es> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-performance>
Hello all,
I am trying to simplify some of the queries I use with my database creating a big view of all the possible attributes my items can have, the view is rather large:
http://pastebin.com/ScnJ8Hd3
I thought that Postgresql would optimize out joins on columns I don't ask for when I use the view but it doesn't, this query:
SELECT referencia
FROM articulo_view
WHERE referencia = '09411000';
Have this query plan:
http://explain.depesz.com/s/4lW0
Maybe I am surpassing some limit? I have tried changing from_collapse_limit and join_collapse_limit but still the planner join the unneeded tables.
Is possible to tell Postgresql do the right thing? If so, how? Thanks!
Regards,
Miguel Angel.
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To: pgsql-performance@postgresql.org
Cc: info@linos.es
Subject: Re: unneeded joins on view
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