| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Csaba Nagy <nagy(at)ecircle-ag(dot)com>, "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>, Christopher Browne <cbbrowne(at)acm(dot)org>, postgres hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Automatic free space map filling |
| Date: | 2006-03-03 15:02:57 |
| Message-ID: | 200603031502.k23F2v707676@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
Alvaro Herrera wrote:
> Csaba Nagy wrote:
>
> > Now when the queue tables get 1000 times dead space compared to their
> > normal size, I get performance problems. So tweaking vacuum cost delay
> > doesn't buy me anything, as not vacuum per se is the performance
> > problem, it's long run time for big tables is.
>
> So for you it would certainly help a lot to be able to vacuum the first
> X pages of the big table, stop, release locks, create new transaction,
> continue with the next X pages, lather, rinse, repeat.
But what about index clearing? When do you scan each index?
--
Bruce Momjian http://candle.pha.pa.us
SRA OSS, Inc. http://www.sraoss.com
+ If your life is a hard drive, Christ can be your backup. +
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