From: Tom Lane <tgl@sss.pgh.pa.us>
To: 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 13:33:19 -0400
Message-ID: <16905.1347557599@sss.pgh.pa.us> (raw)
In-Reply-To: <D48BF41C96B16442B542F5E25C259047011E811299@COM211.communardo.local>
References: <D48BF41C96B16442B542F5E25C259047011E80F02A@COM211.communardo.local>
<5051F227.7090600@krogh.cc>
<26906.1347548059@sss.pgh.pa.us>
<D48BF41C96B16442B542F5E25C259047011E811299@COM211.communardo.local>
Bill Martin <bill.martin@communote.com> writes:
> Tom Lane <tgl@sss.pgh.pa.us> writes:
>> 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.
> How can I adjust the statistics target of the index?
Just pretend it's a table.
ALTER TABLE index_name ALTER COLUMN column_name SET STATISTICS ...
You'll need to look at the index (eg with \d) to see what the name of
the desired column is, since index expressions have system-assigned
column names.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, bill.martin@communote.com
Subject: Re: Planner selects different execution plans depending on limit
In-Reply-To: <16905.1347557599@sss.pgh.pa.us>
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