To: pgsql-sql@postgresql.org
Subject: Re: Comparing two (largish) tables on different servers
References: 
 <71E37EF6B7DCC1499CEA0316A256832801D4BAB0@loki.wc.globexplorer.net>
Message-ID: <opsg72uijkcq72hf@musicbox>
Date: Wed, 10 Nov 2004 01:12:08 +0100
From: =?iso-8859-15?Q?Pierre-Fr=E9d=E9ric_Caillaud?=
	<lists@boutiquenumerique.com>
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 <71E37EF6B7DCC1499CEA0316A256832801D4BAB0@loki.wc.globexplorer.net>
User-Agent: Opera M2/7.54 (Linux, build 751)

	Idea :
	Write a program which connects on the two databases, creates a cursor on  
each to return the rows in order, then compare them as they come (row 1  
 from cursor 1 == row 1 from cursor 2, etc). Fetch in batchs. If there's a  
difference you can then know which row.
	I hope you have an index to sort on, to save you a huge disk sort.

On Tue, 9 Nov 2004 14:41:00 -0800, Gregory S. Williamson  
<gsw@globexplorer.com> wrote:

> This is probably a silly question.
>
> Our runtime deployment of database servers (7.4) involves some  
> redundant/duplicate databases. In order to compare tables (about 5 gigs  
> each) on different servers I unload the things (takes a while etc.),  
> sort them with a UNIX sort and then do a cksum on them.
>
> Is there any way to do this from inside postgres that anyone knows of ?  
> I looked through the manual and the contrib stuff and didn't see much ...
>
> Thanks,
>
> Greg Williamson
> DBA
> GlobeXplorer LLC
>
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