Re: Logical to physical page mapping

From: Claudio Freire <klaussfreire(at)gmail(dot)com>
To: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jan Wieck <JanWieck(at)yahoo(dot)com>, PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Logical to physical page mapping
Date: 2012-10-27 20:09:41
Message-ID: CAGTBQpZ5ZRDPbo1ZjH7fogv1Se2PhS=J6otk35LGN8aDH3ESzw@mail.gmail.com
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On Sat, Oct 27, 2012 at 3:41 PM, Heikki Linnakangas
<hlinnakangas(at)vmware(dot)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.

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