| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | David Fetter <david(at)fetter(dot)org> |
| Cc: | PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Page Checksums |
| Date: | 2011-12-18 10:19:32 |
| Message-ID: | 4EEDBE34.9010409@enterprisedb.com |
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| Thread: | |
| 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
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