Horton

Re: How much do the hint bits help?

Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>

View thread
From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: Simon Riggs <simon@2ndQuadrant.com>
Cc: Merlin Moncure <mmoncure@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2010-12-22T15:37:01Z
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