Received: from malur.postgresql.org ([217.196.149.56])
 by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from
 <pgsql-hackers-owner+M239852=pgsql-hackers-arkari@postgresql.org>)
 id 1Vr7dG-0007l8-AY
 for pgsql-hackers@arkaria.postgresql.org; Thu, 12 Dec 2013 14:52:54 +0000
Received: from localhost ([127.0.0.1] helo=postgresql.org)
 by malur.postgresql.org with smtp (Exim 4.80) (envelope-from
 <pgsql-hackers-owner+M239852=pgsql-hackers-arkari@postgresql.org>)
 id 1Vr7dF-0004Mq-Of
 for pgsql-hackers@arkaria.postgresql.org; Thu, 12 Dec 2013 14:52:53 +0000
Received: from makus.postgresql.org ([2001:4800:7903:4::125])
 by malur.postgresql.org with esmtp (Exim 4.80)
 (envelope-from <tgl@sss.pgh.pa.us>) id 1Vr7dD-0004KL-7R
 for pgsql-hackers@postgresql.org; Thu, 12 Dec 2013 14:52:51 +0000
Received: from sss.pgh.pa.us ([66.207.139.130])
 by makus.postgresql.org with esmtp (Exim 4.80)
 (envelope-from <tgl@sss.pgh.pa.us>) id 1Vr7dA-0001Vj-S5
 for pgsql-hackers@postgresql.org; Thu, 12 Dec 2013 14:52:50 +0000
Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1])
 by sss.pgh.pa.us (8.14.4/8.14.4) with ESMTP id rBCEqdjs003399;
 Thu, 12 Dec 2013 09:52:39 -0500
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Simon Riggs <simon@2ndQuadrant.com>
cc: Andres Freund <andres@2ndQuadrant.com>,
 KONDO Mitsumasa <kondo.mitsumasa@lab.ntt.co.jp>,
 Pavel Stehule <pavel.stehule@gmail.com>,
 =?ISO-8859-1?Q?Fabr=EDzio_Mello?= <fabriziomello@gmail.com>,
 Robert Haas <robertmhaas@gmail.com>,
 Pgsql Hackers <pgsql-hackers@postgresql.org>
Subject: Re: Time-Delayed Standbys
In-reply-to: 
 <CA+U5nMJp5WEqEhjn8S7sA5LahHQUuLDoXpQF2qQL=-TL9gwnKg@mail.gmail.com>
References: 
 <CAFcNs+oXq5ZPaKARRn3VZGzX+AnTZCaEjR6VmQT_tvoFiqgaSg@mail.gmail.com>
 <CA+U5nML64Y7Nf0mpQirk-tOWrV+ZQ3y8DdRgk2mP+e3kGT16Mw@mail.gmail.com>
 <CAFcNs+rAJO6wvzN8zQCTUpii0mC9Ax51JxVhWTsos7xsFdwXjw@mail.gmail.com>
 <CA+TgmoaCL4G+YotjjjFM+J_h0nSkp4gXiiBPDQGHxTcc_T0w-w@mail.gmail.com>
 <CAFcNs+r-GyizHAPDvRz=3XR3BYLUqxpqxrvJq8spk4PJe5hxAA@mail.gmail.com>
 <52A59D10.7020209@lab.ntt.co.jp>
 <CAFj8pRA_9SssJuictTLwoc0EGNEoYADZ1dCVW9UV4TKwi=4Zzw@mail.gmail.com>
 <52A5A17D.5010504@lab.ntt.co.jp>
 <CA+U5nMLfpDp-X3h8Uzztqve1mLw+chJ=akPVzoPDsc35Zdn3TA@mail.gmail.com>
 <20131212110505.GA14510@alap2.anarazel.de>
 <CA+U5nMJp5WEqEhjn8S7sA5LahHQUuLDoXpQF2qQL=-TL9gwnKg@mail.gmail.com>
Comments: In-reply-to Simon Riggs <simon@2ndQuadrant.com>
 message dated "Thu, 12 Dec 2013 11:27:06 +0000"
Date: Thu, 12 Dec 2013 09:52:39 -0500
Message-ID: <3398.1386859959@sss.pgh.pa.us>
X-Pg-Spam-Score: -1.9 (-)
List-Archive: <http://archives.postgresql.org/pgsql-hackers>
List-Help: <mailto:majordomo@postgresql.org?body=help>
List-ID: <pgsql-hackers.postgresql.org>
List-Owner: <mailto:pgsql-hackers-owner@postgresql.org>
List-Post: <mailto:pgsql-hackers@postgresql.org>
List-Subscribe: <mailto:majordomo@postgresql.org?body=sub%20pgsql-hackers>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-hackers>
X-Mailing-List: pgsql-hackers
Precedence: bulk
Sender: pgsql-hackers-owner@postgresql.org

Simon Riggs <simon@2ndQuadrant.com> writes:
> On 12 December 2013 11:05, Andres Freund <andres@2ndquadrant.com> wrote:
>>> My suggestion would be to add the TZ to the checkpoint record. This
>>> way all users of WAL can see the TZ of the master and act accordingly.
>>> I'll do a separate patch for that.

>> Intuitively I'd say that might be useful - but I am not reall sure what
>> for. And we don't exactly have a great interface for looking at a
>> checkpoint's data. Maybe add it to the control file instead?

> That's actually what I had in mind, I just phrased it badly in mid-thought.

I don't think you realize what a can of worms that would be.  There's
no compact representation of "a timezone", unless you are only proposing
to store the UTC offset; and frankly I'm not particularly seeing the point
of that.

			regards, tom lane


-- 
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers