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Date: Wed, 11 Jan 2006 02:00:08 -0700
From: Michael Fuhr <mike@fuhr.org>
To: Robert Creager <Robert_Creager@LogicalChaos.org>
Cc: PGPerformance <pgsql-performance@postgresql.org>
Subject: Re: Index isn't used during a join.
Message-ID: <20060111090008.GA51672@winnie.fuhr.org>
References: <20060109212338.6420af12@thunder.logicalchaos.org>
	<20060110055818.GA55076@winnie.fuhr.org>
	<20060110221055.053596ab@thunder.logicalchaos.org>
	<20060111075655.GA51292@winnie.fuhr.org>
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On Wed, Jan 11, 2006 at 12:56:55AM -0700, Michael Fuhr wrote:
> WHERE ...
>   AND doy >= EXTRACT(doy FROM now() - '24 hour'::interval)
>   AND doy <= EXTRACT(doy FROM now())

To work on 1 Jan this should be more like

WHERE ...
  AND (doy = EXTRACT(doy FROM now() - '24 hour'::interval) OR
       doy = EXTRACT(doy FROM now()))

In any case the point is to add conditions to the WHERE clause that
will use an index on the table for which you're currently getting
a sequential scan.

-- 
Michael Fuhr