Horton

Re: Logical to physical page mapping

Claudio Freire <klaussfreire@gmail.com>

View thread View on postgr.es
From: Claudio Freire <klaussfreire@gmail.com>
To: Heikki Linnakangas <hlinnakangas@vmware.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Jan Wieck <JanWieck@yahoo.com>, PostgreSQL Development <pgsql-hackers@postgresql.org>
Date: 2012-10-27T20:09:41Z
Lists: pgsql-hackers 
On Sat, Oct 27, 2012 at 3:41 PM, Heikki Linnakangas
<hlinnakangas@vmware.com> wrote:
>
>> I think you're just moving the atomic-write problem from the data pages
>> to wherever you keep these pointers.
>
>
> If the pointers are stored as simple 4-byte integers, you probably could
> assume that they're atomic, and won't be torn.

That could backfire.