| From: | Denis Perchine <dyp(at)perchine(dot)com> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Caching number of blocks in relation to avoi lseek. |
| Date: | 2000-06-12 18:11:39 |
| Message-ID: | 00061301132305.07937@dyp |
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| Lists: | pgsql-hackers pgsql-patches |
> > Question: is this field properly updated? Could it be used instead of RelationGetNumberOfBlocks
> > which calls lseek.
>
> Probably should be kept up-to-date. Currently only vacuum sets it. It
> would have to be kept up-to-date for every INSERT/UPDATE that adds a block.
If we can acomplish this it will be quite big speed improvement. I saw lots of such calls
and strace show lots of lseek(,,END) calls. I would do this, but I do not know the code so
well to be sure I will walk through all places.
--
Sincerely Yours,
Denis Perchine
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