| From: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| 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 13:36:36 |
| Message-ID: | 51BB1C64.9000901@vmware.com |
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| Lists: | pgsql-hackers |
On 14.06.2013 16:21, Tom Lane wrote:
> 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?
Correct. We're doing the latter, see XLogSaveBufferForHint().
- Heikki
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