Re: Re: database system identifier differs between the primary and standby

Thanks a lot.
I got the idea now.

Rajib Deka
SIEMENS Ltd.
Robert V Chandran Tower, First Floor, West Wing,
#149, Velechery Tambaram Main Road, Pallikaranai, Chennai-100, INDIA.
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Mob: +91-9176780669 | E-Mail: rajib(dot)deka(at)siemens(dot)com

-----Original Message-----
From: Cédric Villemain [mailto:cedric(dot)villemain(dot)debian(at)gmail(dot)com]
Sent: Thursday, April 21, 2011 9:56 PM
To: Robert Haas
Cc: Simon Riggs; Deka, Rajib IN MAA SL; pgsql-hackers
Subject: Re: [HACKERS] Re: database system identifier differs between the primary and standby

2011/4/21 Robert Haas <robertmhaas(at)gmail(dot)com>:
> On Thu, Apr 21, 2011 at 6:38 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>> On Thu, Apr 21, 2011 at 10:31 AM, rajibdk <rajib(dot)deka(at)siemens(dot)com> wrote:
>>> What does that database system identifier means? Is it related to DB
>>> transactions' or unique to a version?
>>
>> Regrettably, it means you didn't follow the documented procedure.
>>
>> It isn't possible to do it any other way, so those questions are a distraction.
>
> I think they are perfectly good questions. If someone is trying to
> understand how our product works, we should encourage that.

Agree those are perfectly good question to ask on -general. (but on
hackers it looks excessive)
Rajib: this is relative to initdb, it produces one key to be able to
check later if postgresql is restoring the good files.
(
from sources :
/*
* Unique system identifier --- to ensure we match up xlog files with the
* installation that produced them.
*/
)

Robert, Please don't add confusion to your signature : PostgreSQL is a
community project not an enterprise product.

>
> --
> Robert Haas
> EnterpriseDB: http://www.enterprisedb.com
> The Enterprise PostgreSQL Company
>
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--
Cédric Villemain 2ndQuadrant
http://2ndQuadrant.fr/ PostgreSQL : Expertise, Formation et Support

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