Re: Row locking during UPDATE

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От Andrew Sullivan
Тема Re: Row locking during UPDATE
Дата
Msg-id 20030912192800.GJ26188@libertyrms.info
обсуждение исходный текст
Ответ на Re: Row locking during UPDATE  ("David F. Skoll" <dfs@roaringpenguin.com>)
Список pgsql-admin
On Fri, Sep 12, 2003 at 09:53:47AM -0400, David F. Skoll wrote:
> > Note that if you do
> > this very frequently, and you have also to select the summary data,
> > it won't work (as I have learned from painful experience) because
> > the holding table will gradually build up a lot of dead tuples.
>
> That doesn't seem to be a problem; after the summary, I do a
> VACUUM and the holding table seems to shrink down nicely.

You apparently don't have the contention that we did.  Are your
transactions short?  We had a problem with this sort of design, but I
think it was because we had some transactions which ran long and
depended on the summarised results.  But if it works for you, great.

A

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Andrew Sullivan                         204-4141 Yonge Street
Liberty RMS                           Toronto, Ontario Canada
<andrew@libertyrms.info>                              M2P 2A8
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