X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org
Received: from localhost (unknown [200.46.204.144])
	by svr1.postgresql.org (Postfix) with ESMTP id 22B073A4C73
	for <pgsql-sql-postgresql.org@localhost.postgresql.org>;
	Sat, 20 Nov 2004 10:44:37 +0000 (GMT)
Received: from svr1.postgresql.org ([200.46.204.71])
	by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024)
	with ESMTP id 89034-09
	for <pgsql-sql-postgresql.org@localhost.postgresql.org>;
	Sat, 20 Nov 2004 10:44:27 +0000 (GMT)
Received: from mail.logi-track.com (burro.logi-track.com [213.239.193.212])
	by svr1.postgresql.org (Postfix) with ESMTP id 4534C3A3FFF
	for <pgsql-sql@postgresql.org>; Sat, 20 Nov 2004 10:44:28 +0000 (GMT)
Received: from kingfisher.intern.logi-track.com (p5088F44C.dip0.t-ipconnect.de
	[80.136.244.76])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by mail.logi-track.com (Postfix) with ESMTP id A1D9A30033;
	Sat, 20 Nov 2004 11:44:28 +0100 (CET)
Received: from kingfisher.intern.logi-track.com (localhost [127.0.0.1])
	by kingfisher.intern.logi-track.com (Postfix) with SMTP id 19013AB0D0;
	Sat, 20 Nov 2004 11:44:12 +0100 (CET)
Date: Sat, 20 Nov 2004 11:44:11 +0100
From: Markus Schaber <schabios@logi-track.com>
To: pgsql-sql@postgresql.org
Subject: Re: Move table between schemas
Message-ID: <20041120114411.28c05fcf@kingfisher.intern.logi-track.com>
In-Reply-To: <20041116110538.GA15247@phlogiston.dyndns.org>
References: <20041116100234.635fcd7e@kingfisher.intern.logi-track.com>
	<20041116110538.GA15247@phlogiston.dyndns.org>
Organization: logi-track ag, =?ISO-8859-15?Q?z=FCrich?=
X-Mailer: Sylpheed-Claws 0.9.12b (GTK+ 1.2.10; i386-pc-linux-gnu)
X-Face: Nx5T&>Nj$VrVPv}sC3IL&)TqHHOKCz/|)R$i"*r@w0{*I6w;
	UNU_hdl1J4NI_m{IMztq=>cmM}1gCLbAF+9\#CGkG8}Y{x%SuQ>1#t:;
	Z(|\qdd[i]HStki~#w1$TPF}:0w-7"S\Ev|_a$K<GcL?@F\BY,ut6tC0P<$eV&ypzvlZ~R00!A
X-PGP-Key: http://schabi.de/pubkey.asc
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-15
Content-Transfer-Encoding: quoted-printable
X-Virus-Scanned: by amavisd-new at hub.org
X-Spam-Status: No, hits=0.0 tagged_above=0.0 required=5.0 tests=
X-Spam-Level: 
X-Archive-Number: 200411/211
X-Sequence-Number: 19530

Hi, Andrew,

On Tue, 16 Nov 2004 06:05:38 -0500
Andrew Sullivan <ajs@crankycanuck.ca> wrote:

> > Is there an easy way to move a table to another schema in PostgreSQL 7.=
4?
> >=20
> > ALTER TABLE and ALTER SCHEMA don't have this options.
>=20
> CREATE TABLE newschema.newtable AS SELECT * FROM oldschema.oldtable=20
> oughta work.

This has several drawbacks I can see for now:

- For large tables (some Gigs of data), this needs a long time and
produces heavy I/O load on the server.

- You need twice the disk space until you can delete the old table.

- Indices, triggers, sequences and constraints are not transferred. When
the target schema is first in the search path of the application, this
means that the application works on an incomplete table until I finished
the transition..

- It does not automatically convert views or foreign key constraints
that point to the table.

- The operation is not atomic, thus there may be inserts and updates
into the old table that get lost while the "CREATE...SELECT...;DROP
TABLE...;" runs.


Is there any (possibly ugly, fiddling with system tables) atomic way to
move a table between schemas? It should not be much more difficult
compared to e. G. renaming a table to implement this, so I couuld not
imagine this does not exist until I tried to find out how to do it.


Thanks,
markus
--=20
markus schaber | dipl. informatiker
logi-track ag | rennweg 14-16 | ch 8001 z=FCrich
phone +41-43-888 62 52 | fax +41-43-888 62 53
mailto:schabios@logi-track.com | www.logi-track.com