Re: Frequent Update Project: Design Overview of HOTUpdates

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От Simon Riggs
Тема Re: Frequent Update Project: Design Overview of HOTUpdates
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Msg-id 1163095038.3634.490.camel@silverbirch.site
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Ответ на Re: Frequent Update Project: Design Overview of HOT Updates  (Martijn van Oosterhout <kleptog@svana.org>)
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On Thu, 2006-11-09 at 18:49 +0100, Martijn van Oosterhout wrote:
> Nice idea, just one question:

> It seems to me that bitmap index scans will get these same
> characteristics also, right? The bitmap scan will have to follow the
> chain of any possibly matching tuple in any of the blocks that are in
> the bitmap, right?

Yes, they would identify the root tuples. The whole chain has matching
index values, by definition, so the re-evaluation for lossy bitmaps will
work just the same before the actual tuple is retrieved by walking the
chain (if required).

--  Simon Riggs              EnterpriseDB   http://www.enterprisedb.com




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