From: Tom Lane <tgl@sss.pgh.pa.us>
To: Laurent Raufaste <analogue@glop.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: PG planning randomly ?
Date: Tue, 26 Feb 2008 11:31:42 -0500
Message-ID: <3637.1204043502@sss.pgh.pa.us> (raw)
In-Reply-To: <669dc9710802260719h61d846b3hd50b7f547bcb82c3@mail.gmail.com>
References: <669dc9710802260719h61d846b3hd50b7f547bcb82c3@mail.gmail.com>
"Laurent Raufaste" <analogue@glop.org> writes:
> I'm having some issues with this simple query:
> SELECT
> _comment.*,
> _article.title AS article_title,
> _article.reference AS article_reference
> FROM
> _comment
> INNER JOIN _article
> ON _article.id = _comment.parent_id
> WHERE
> _comment.path <@ '0.1.3557034'
> ORDER BY
> _comment.date_publishing DESC
> OFFSET 0
> LIMIT 5
> ;
> The varying information here is the ltree path "0.1.3557034"
What PG version is this?
If it's 8.2 or later then increasing the stats target for _comment.path
to 100 or more would likely help.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, analogue@glop.org
Subject: Re: PG planning randomly ?
In-Reply-To: <3637.1204043502@sss.pgh.pa.us>
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