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From: Noah Misch <noah@leadboat.com>
To: Michael Meskes <meskes@postgresql.org>
To: Boszormenyi Zoltan <zb@cybertec.at>
To: Robert Haas <robertmhaas@gmail.com>
To: PG Hackers <pgsql-hackers@postgresql.org>
To: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: Bruce Momjian <bruce@momjian.us>
Subject: Re: ECPG FETCH readahead
Date: Sun, 8 Apr 2012 22:15:19 -0400
Message-ID: <20120409021519.GD11987@tornado.leadboat.com> (raw)
In-Reply-To: <20120408142501.GA21513@feivel.credativ.lan>
References: <20120306110658.GC15988@tornado.leadboat.com>
	<CA+TgmoaBGLpW5V3nFES-McLbZyY_9nUvpnFLjT7zAYuVPu809A@mail.gmail.com>
	<4F6D9893.3030300@cybertec.at>
	<20120329004323.GA17329@tornado.leadboat.com>
	<4F74409C.3050904@cybertec.at>
	<20120329170341.GA4142@tornado.leadboat.com>
	<4F74E6A7.8040204@cybertec.at>
	<20120407112008.GA2286@feivel.credativ.lan>
	<20120407155042.GB11987@tornado.leadboat.com>
	<20120408142501.GA21513@feivel.credativ.lan>

On Sun, Apr 08, 2012 at 04:25:01PM +0200, Michael Meskes wrote:
> On Sat, Apr 07, 2012 at 11:50:42AM -0400, Noah Misch wrote:
> > I do call your attention to a question I raised in my second review: if a
> > program contains "DECLARE foo READAHEAD 5 CURSOR FOR ..." and the user runs
> > the program with ECPGFETCHSZ=10 in the environment, should that cursor use a
> > readahead window of 5 or of 10?  Original commentary:
> > http://archives.postgresql.org/message-id/20120329004323.GA17329@tornado.leadboat.com
> 
> I'd say it should be 5. I don't like an environment variable overwriting a
> hard-coded setting. I think this is what you, Noah, thought, too, right?

Yes.



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