Message-ID: <46A724CB.3030405@archonet.com>
Date: Wed, 25 Jul 2007 11:24:11 +0100
From: Richard Huxton <dev@archonet.com>
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To: Jyoti Seth <jyotiseth2001@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Database synchronization
References: <20070724143737.GA25948@apartia.fr>
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Try not to start a new thread (question) by replying to an old one - it 
can mean some people don't see your question.

Jyoti Seth wrote:
> Hi,
> 
> I have two postgres databases "Db1" and "Db2" on different linux servers.
> "DB1" is my master server and its data updates very frequently.
> 
> My application access DB2 database, which in turn requires data from Db1
> database. 

OK

> The same can be achieved in either of the following ways:
> 1. I can have the same tables from Db1 in the Db2 database and use some
> replication process to update these tables say using Slony-I. And then our
> application accesses the data from the single database.

Yes

> 2. Or I can use dblink to fetch the data from the master database only.

Yes

also:

3. Write a layer in your application / between the application & 
database which routes queries to the correct database.

> My problem is my master database changes frequently and I always require the
> latest information.

Well, if by "latest" you mean you can't have any delay at all you'll 
have to use #2 or #3.

However, that could be slow if you need to join a lot of data from DB1 
to DB2. Can you provide more details of what each contains?

-- 
   Richard Huxton
   Archonet Ltd