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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Nikolas Everett <nik9000@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Kris Jurka <books@ejurka.com>
Cc: Dave Crooke <dcrooke@gmail.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-jdbc@postgresql.org, pgsql-performance <pgsql-performance@postgresql.org>
Cc: Scott Carey <scott@richrelevance.com>
Subject: Re: SOLVED ... Re: Getting rid of a cursor from JDBC .... Re: [PERFORM] Re: HELP: How to tame the 8.3.x JDBC driver with a biq guery result set
Date: Wed, 21 Apr 2010 11:30:26 -0400
Message-ID: <24144.1271863826@sss.pgh.pa.us> (raw)
In-Reply-To: <q2qd4e11e981004210807ua364abbbua4ae2fb0a91ac053@mail.gmail.com>
References: <q2sca24673e1004191633j10b1124amf1eb51f3bd84f19a@mail.gmail.com>
	<4BCD73AF0200002500030BC2@gw.wicourts.gov>
	<w2kca24673e1004200847k77429a1cra0a6f3560d407d8e@mail.gmail.com>
	<4BCD90D80200002500030BDD@gw.wicourts.gov>
	<x2zca24673e1004201229n653f4e69vd274af4a4aa22d09@mail.gmail.com>
	<4BCDC6B90200002500030C09@gw.wicourts.gov>
	<w2oca24673e1004201340p703b0121iaf852aa28695be65@mail.gmail.com>
	<alpine.BSO.2.00.1004201644280.6736@leary.csoft.net>
	<g2w603c8f071004210741y69db6e92p5a7d18c4fc2940a@mail.gmail.com>
	<q2qd4e11e981004210807ua364abbbua4ae2fb0a91ac053@mail.gmail.com>

>> On Tue, Apr 20, 2010 at 5:05 PM, Kris Jurka <books@ejurka.com> wrote:
>>> ... There are three ways to plan a PreparedStatement:

FWIW, I think there is some consensus to experiment (in the 9.1 cycle)
with making the server automatically try replanning of parameterized
queries with the actual parameter values substituted.  It'll keep doing
so if it finds that that produces a significantly better plan than the
generic parameterized plan; which is what you'd expect if there's a
chance to optimize a LIKE search, eliminate partitions, etc.

			regards, tom lane



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