From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jesper Krogh <jesper@krogh.cc>
Cc: Bill Martin <bill.martin@communote.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Planner selects different execution plans depending on limit
Date: Thu, 13 Sep 2012 10:54:19 -0400
Message-ID: <26906.1347548059@sss.pgh.pa.us> (raw)
In-Reply-To: <5051F227.7090600@krogh.cc>
References: <D48BF41C96B16442B542F5E25C259047011E80F02A@COM211.communardo.local>
<5051F227.7090600@krogh.cc>
Jesper Krogh <jesper@krogh.cc> writes:
> On 13/09/12 16:42, Bill Martin wrote:
>> Yes, I've run the ANALYZE command. Regards, Bill Martin
> The main problem in your case is actually that you dont store the
> tsvector in the table.
Oh, duh, obviously I lack caffeine this morning.
> If you store to_tsvector('simple',content.content) in a column in
> the database and search against that instead
> then you'll allow PG to garther statistics on the column and make the
> query-planner act according to that.
He can do it without having to change his schema --- but it's the index
column, not the underlying content column, that needs its statistics
target adjusted.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, jesper@krogh.cc, bill.martin@communote.com
Subject: Re: Planner selects different execution plans depending on limit
In-Reply-To: <26906.1347548059@sss.pgh.pa.us>
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