| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Csaba Nagy <nagy(at)ecircle-ag(dot)com> |
| Cc: | "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, 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 14:40:40 |
| Message-ID: | 20060303144040.GC5269@surnet.cl |
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| Lists: | pgsql-hackers |
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.
This is perfectly doable, it only needs enough motivation from a
knowledgeable person.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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