Horton

Re: Page Checksums

Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>

View thread
From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: David Fetter <david@fetter.org>
Cc: PG Hackers <pgsql-hackers@postgresql.org>
Date: 2011-12-18T10:19:32Z
Lists: pgsql-hackers 
On 18.12.2011 10:54, David Fetter wrote:
> On Sun, Dec 18, 2011 at 10:14:38AM +0200, Heikki Linnakangas wrote:
>> On 17.12.2011 23:33, David Fetter wrote:
>>> If this introduces new failure modes, please detail, and preferably
>>> demonstrate, just what those new modes are.
>>
>> Hint bits, torn pages ->  failed CRC. See earlier discussion:
>>
>> http://archives.postgresql.org/pgsql-hackers/2009-11/msg01975.php
>
> The patch requires that full page writes be on in order to obviate
> this problem by never reading a torn page.

Doesn't help. Hint bit updates are not WAL-logged.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com