From: Bruce Momjian <bruce@momjian.us>
To: Pierre C <lists@peufeu.com>
Cc: Beaver, John E <John_Beaver@hms.harvard.edu>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: *** PROBABLY SPAM *** Does the psql executable support a "fetch many" approach when dumping large queries to stdout?
Date: Mon, 12 Apr 2010 22:49:29 -0400 (EDT)
Message-ID: <201004130249.o3D2nUd02232@momjian.us> (raw)
In-Reply-To: <op.vajyiejneorkce@immo.peufeu.com>
Pierre C wrote:
> > Does the psql executable have any ability to do a "fetch many", using a
> > server-side named cursor, when returning results? It seems like it tries
> > to retrieve the query entirely to local memory before printing to
> > standard out.
>
> I think it grabs the whole result set to calculate the display column
> widths. I think there is an option to tweak this but don't remember which,
> have a look at the psql commands (\?), formatting section.
See the FETCH_COUNT variable mentioned in the psql manual page.
--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
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To: pgsql-performance@postgresql.org
Cc: bruce@momjian.us, lists@peufeu.com, John_Beaver@hms.harvard.edu
Subject: Re: *** PROBABLY SPAM *** Does the psql executable support a "fetch many" approach when dumping large queries to stdout?
In-Reply-To: <201004130249.o3D2nUd02232@momjian.us>
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