Horton

Re: Automatic free space map filling

Bruce Momjian <pgman@candle.pha.pa.us>

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From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Csaba Nagy <nagy@ecircle-ag.com>, "Matthew T. O'Connor" <matthew@zeut.net>, Christopher Browne <cbbrowne@acm.org>, postgres hackers <pgsql-hackers@postgresql.org>
Date: 2006-03-03T15:02:57Z
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. +