Re: Block-level CRC checks

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От Robert Haas
Тема Re: Block-level CRC checks
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Msg-id 603c8f070912010646kcca2291m94e75a9d2818c9c0@mail.gmail.com
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Ответ на Re: Block-level CRC checks  (Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>)
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On Tue, Dec 1, 2009 at 9:40 AM, Heikki Linnakangas
<heikki.linnakangas@enterprisedb.com> wrote:
> Even if rescanning every page in the cluster was feasible from a
> performance point-of-view, it would make the CRC checking a lot less
> useful. It's not hard to imagine that when a hardware glitch happens
> causing corruption, it also causes the system to crash. Recalculating
> the CRCs after crash would mask the corruption.

Yeah.  Thanks for the explanation - I think I understand the problem now.

...Robert


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