From: Dave Cramer <pg@fastcrypt.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Guillaume Smet <guillaume.smet@gmail.com>
Cc: Guillaume Cottenceau <gc@mnc.ch>
Cc: Mario Splivalo <mario.splivalo@megafon.hr>
Cc: pgsql-performance@postgresql.org
Cc: pgsql-jdbc@postgresql.org
Subject: Re: [PERFORM] Query much slower when run from postgres function
Date: Mon, 9 Mar 2009 15:56:53 -0400
Message-ID: <491f66a50903091256n7fe4a3f6i93267d0d53b983cb@mail.gmail.com> (raw)
In-Reply-To: <5165.1236618994@sss.pgh.pa.us>
References: <49B51B60.6030600@megafon.hr>
<27649.1236616294@sss.pgh.pa.us>
<87fxhmmygj.fsf@meuh.mnc.lan>
<1d4e0c10903091004m758d7ea2s91e33631be81215a@mail.gmail.com>
<5165.1236618994@sss.pgh.pa.us>
On Mon, Mar 9, 2009 at 1:16 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Guillaume Smet <guillaume.smet@gmail.com> writes:
> > Unnamed prepared statements are planned after binding the values,
> > starting with 8.3, or more precisely starting with 8.3.2 as early 8.3
> > versions were partially broken on this behalf.
>
> No, 8.2 did it too (otherwise we wouldn't have considered 8.3.0 to be
> broken...). The thing I'm not too clear about is what "use of an
> unnamed statement" translates to for a JDBC user.
>
Tom,
The driver will use unnamed statements for all statements until it sees the
same statement N times where N is 5 I believe, after that it uses a named
statement.
Dave
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To: pgsql-performance@postgresql.org
Cc: pg@fastcrypt.com, tgl@sss.pgh.pa.us, guillaume.smet@gmail.com, gc@mnc.ch, mario.splivalo@megafon.hr, pgsql-jdbc@postgresql.org
Subject: Re: [PERFORM] Query much slower when run from postgres function
In-Reply-To: <491f66a50903091256n7fe4a3f6i93267d0d53b983cb@mail.gmail.com>
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