Re: Automatic free space map filling

Matthew T. O'Connor wrote:
> 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.
> 
> I got the impression that Csaba is looking more for "multiple 
> simultaneous vacuum" more than the partial vacuum.

So he rather needs Hannu Krosing's patch for simultaneous vacuum ...

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.