Re: crash-safe visibility map, take three

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От Jim Nasby
Тема Re: crash-safe visibility map, take three
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Msg-id CCE55EDE-8354-4E2B-A815-E5A29018D33F@nasby.net
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Ответ на Re: crash-safe visibility map, take three  (Robert Haas <robertmhaas@gmail.com>)
Ответы Re: crash-safe visibility map, take three  (Robert Haas <robertmhaas@gmail.com>)
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On Dec 1, 2010, at 2:59 PM, Robert Haas wrote:
> 2. Hint bits are necessary because an old XID can't be viewed as
> guaranteed committed.

Hmm... I thought hint bits were necessary because it's too expensive to query CLOG for every tuple. If my understanding
iscorrect then if we fix the CLOG performance issue we don't need hint bits anymore. 
--
Jim C. Nasby, Database Architect                   jim@nasby.net
512.569.9461 (cell)                         http://jim.nasby.net

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