Re: Patch for fail-back without fresh backup

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
Cc: Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Samrat Revagade <revagade(dot)samrat(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Patch for fail-back without fresh backup
Date: 2013-06-14 13:21:52
Message-ID: 8275.1371216112@sss.pgh.pa.us
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Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> writes:
> On 14.06.2013 16:08, Tom Lane wrote:
>> Refresh my memory as to why we need to WAL-log hints for checksumming?

> Torn pages:

So it's not that we actually need to log the individual hint bit
changes, it's that we need to WAL-log a full page image on the first
update after a checkpoint, so as to recover from torn-page cases.
Which one are we doing?

regards, tom lane

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