| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: How much do the hint bits help? |
| Date: | 2010-12-22 15:37:01 |
| Message-ID: | 4D121B1D.6030503@enterprisedb.com |
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| Lists: | pgsql-hackers |
On 22.12.2010 17:31, Simon Riggs wrote:
> On Wed, 2010-12-22 at 17:01 +0200, Heikki Linnakangas wrote:
>> Do you envision that the CRC is calculated at every update, or only when
>> a page is written out from the buffer cache?
>
> At every update, so there is a clear assertion that the CRC matches the
> block.
Umm, when do you check the CRC? Every time the page is locked? Every
time it's updated? If don't verify the CRC, what is it good for?
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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