Re: Query performance issue

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From: Jayadevan <Jayadevan.Maymala@ibsplc.com>
To: pgsql-performance@postgresql.org
Subject: Re: Query performance issue
Date: Sun, 4 Sep 2011 11:06:31 -0700 (PDT)
Message-ID: <1315159591749-4768047.post@n5.nabble.com> (raw)
In-Reply-To: <12017.1315149499@sss.pgh.pa.us>
References: <OF6B813C80.12B50253-ON652578FD.00310FC3-652578FD.00317C74@ibsplc.com>
	<4E6345520200002500040BD6@gw.wicourts.gov>
	<12017.1315149499@sss.pgh.pa.us>

I don't think I understood all that. Anyway, is there a way to fix this -
either by rewriting the query or by creating an index? The output does match
what I am expecting.  It does take more than 10 times the time taken by
Oracle for the same result, with PostgreSQL taking more than 20 minutes. I
am sort of stuck on this since this query does get executed often. By the
way, changing the filter from FAMNAM to GIVENNAME fetches results in 90
seconds. Probably there is a difference in the cardinality of values in
these 2 columns.

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