Date: Thu, 31 May 2007 09:36:37 -0400
From: Bill Moran <wmoran@collaborativefusion.com>
To: Ireneusz Pluta <ipluta@wp.pl>
Cc: pgsql-performance@postgresql.org
Subject: Re: DB cluster sharing between 32 and 64 bit software
 versions
Message-Id: <20070531093637.6c536dca.wmoran@collaborativefusion.com>
In-Reply-To: <465ECBE4.9020600@wp.pl>
References: <465ECBE4.9020600@wp.pl>
Organization: Collaborative Fusion
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

In response to Ireneusz Pluta <ipluta@wp.pl>:

> Hello,
> 
> I am going to build a new PostgreSQL dedicated server, on FreeBSD. Before it goes to production 
> service I need to make some tests and take configuration decisions, focused on my application needs. 
> Usual thing. One of them is selection of one of 32 or 64 bit versions of both OS and PG. What I am 
> going to do is to install both versions on different filesystems of the same machine. As a 
> consequence I would also have to deal with two independent copies of my real databases on which I 
> want to perfrom my tests. However, the databases are rather large, so I am thinking about 
> possibilities of not to have to restore two copies of my data, but use just one instead, and sharing 
> it between the 32 and 64 versions, across reboots.
> 
> Would that scenario work, or I am simply too naive considering it?

It won't work, unfortunately.  The on-disk representation of the data is
different between ia32 and amd64.

-- 
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran@collaborativefusion.com
Phone: 412-422-3463x4023