Re: crash-safe visibility map, take three

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От Robert Haas
Тема Re: crash-safe visibility map, take three
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Msg-id AANLkTimPZJ6200fAdOz1RwGh3hegw+ZZrHpkMui7ChKt@mail.gmail.com
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Ответ на Re: crash-safe visibility map, take three  (Robert Haas <robertmhaas@gmail.com>)
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On Tue, Nov 30, 2010 at 12:25 PM, Robert Haas <robertmhaas@gmail.com> wrote:
> On Tue, Nov 30, 2010 at 12:22 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> But having said that, I wonder whether we need a full-page image for
>> a WAL-logged action that is known to involve only setting a single bit
>> and updating LSN.  Would omitting the FPI be any more risky than what
>> happens now (ie, the page does get written back to disk at some point,
>> without any image from which it can be rewritten if the write fails...)
>
> That's pretty much exactly what Heikki proposed 35 minutes ago, and
> you objected 6 minutes later.  I still think it might work.

Oh, I see the difference now.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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