From: Jim C. Nasby <jim@nasby.net>
To: Steve <cheetah@tanabi.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: Copy database performance issue
Date: Tue, 24 Oct 2006 19:25:13 -0500
Message-ID: <20061025002513.GC26892@nasby.net> (raw)
In-Reply-To: <Pine.GSO.4.64.0610231734220.3930@kingcheetah.tanabi.org>
References: <Pine.GSO.4.64.0610231734220.3930@kingcheetah.tanabi.org>
On Mon, Oct 23, 2006 at 05:51:40PM -0400, Steve wrote:
> Hello there;
>
> I've got an application that has to copy an existing database to a new
> database on the same machine.
>
> I used to do this with a pg_dump command piped to psql to perform the
> copy; however the database is 18 gigs large on disk and this takes a LONG
> time to do.
>
> So I read up, found some things in this list's archives, and learned that
> I can use createdb --template=old_database_name to do the copy in a much
> faster way since people are not accessing the database while this copy
> happens.
>
>
> The problem is, it's still too slow. My question is, is there any way I
> can use 'cp' or something similar to copy the data, and THEN after that's
> done modify the database system files/system tables to recognize the
> copied database?
AFAIK, that's what initdb already does... it copies the database,
essentially doing what cp does.
> For what it's worth, I've got fsync turned off, and I've read every tuning
> thing out there and my settings there are probably pretty good. It's a
> Solaris 10 machine (V440, 2 processor, 4 Ultra320 drives, 8 gig ram) and
> here's some stats:
I don't think any of the postgresql.conf settings will really come into
play when you're doing this...
--
Jim Nasby jim@nasby.net
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
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To: pgsql-performance@postgresql.org
Cc: jim@nasby.net, cheetah@tanabi.org
Subject: Re: Copy database performance issue
In-Reply-To: <20061025002513.GC26892@nasby.net>
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