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help / color / mirror / Atom feedFrom: Patrick TJ McPhee <[email protected]>
To: [email protected]
Subject: Re: index vs. seq scan choice?
Date: Fri, 08 Jun 2007 04:13:54 -0000
Message-ID: <[email protected]> (raw)
References: <8C5B026B51B6854CBE88121DBF097A86C3A30D@ehost010-33.exch010.intermedia.net>
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<8C5B026B51B6854CBE88121DBF097A86DEA6C5@ehost010-33.exch010.intermedia.net>
<[email protected]>
In article <[email protected]>, Tom Lane <[email protected]> wrote:
% "George Pavlov" <[email protected]> writes:
% >> From: Joshua D. Drake [mailto:[email protected]]
% >> In those rare cases wouldn't it make more sense to just set
% >> enable_seqscan to off; run query; set enable_seqscan to on;
%
% > 1. these cases are not that rare (to me);
%
% It strikes me that you probably need to adjust the planner cost
% parameters to reflect reality on your system. Usually dropping
% random_page_cost is the way to bias the thing more in favor of
% index scans.
Also, increasing effective_cache_size.
(And increasing statistics...)
--
Patrick TJ McPhee
North York Canada
[email protected]
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