What does that database system identifier means? Is it related to DB 
transactions' or unique to a version?

Rajib Deka
SIEMENS Ltd.
Robert V Chandran Tower, First Floor, West Wing,
#149, Velechery Tambaram Main Road, Pallikaranai, Chennai-100, INDIA.
www.siemens.com<http://www.siemens.com>

Mob: +91-9176780669 | E-Mail: rajib.d...@siemens.com
________________________________
From: Robert Haas [via PostgreSQL] 
[mailto:ml-node+4326869-1711138747-200...@n5.nabble.com]
Sent: Wednesday, April 20, 2011 7:20 PM
To: Deka, Rajib IN MAA SL
Subject: Re: database system identifier differs between the primary and standby

On Wed, Apr 20, 2011 at 9:28 AM, rajibdk <[hidden 
email]</user/SendEmail.jtp?type=node&node=4326869&i=0&by-user=t>> wrote:
> We are getting the following log while configuring hot standby,
>
> 2011-04-20 17:34:40 ETC/GMT FATAL:  the database system is starting up
> 2011-04-20 17:34:41 ETC/GMT FATAL:  database system identifier differs
> between the primary and standby
> 2011-04-20 17:34:41 ETC/GMT DETAIL:  The primary's identifier is
> 5592072752411433371, the standby's identifier is 5597615802844953578.
>
> PostgreSQL Version: 9.0.2

You need to initialize the slave using a hot backup taken on the master.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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