Re: Autovacuum / full vacuum

От: Michael Riess
Тема: Re: Autovacuum / full vacuum
Дата: ,
Msg-id: dqiv77$2ijp$1@news.hub.org
(см: обсуждение, исходный текст)
Ответ на: Re: Autovacuum / full vacuum  ("Matthew T. O'Connor")
Ответы: Re: Autovacuum / full vacuum  (Tom Lane)
Re: Autovacuum / full vacuum  (Markus Schaber)
Список: pgsql-performance

Скрыть дерево обсуждения

Autovacuum / full vacuum  (Michael Riess, )
 Re: Autovacuum / full vacuum  (Christopher Kings-Lynne, )
  Re: Autovacuum / full vacuum  (Michael Riess, )
   Re: Autovacuum / full vacuum  (Michael Stone, )
   Re: Autovacuum / full vacuum  ("Matthew T. O'Connor", )
    Re: Autovacuum / full vacuum  (Markus Schaber, )
    Re: Autovacuum / full vacuum  (Michael Riess, )
     Re: Autovacuum / full vacuum  (Tom Lane, )
     Re: Autovacuum / full vacuum  (Markus Schaber, )
    Re: Autovacuum / full vacuum  (Andrew Sullivan, )
  Re: Autovacuum / full vacuum  (Pandurangan R S, )
 Re: Autovacuum / full vacuum  (Alvaro Herrera <-ip.org>, )
 Re: Autovacuum / full vacuum  (Christopher Browne, )
  Re: Autovacuum / full vacuum  (Michael Riess, )
   Re: Autovacuum / full vacuum  (Andrew Sullivan, )
 Re: Autovacuum / full vacuum  ("Larry Rosenman", )
 Re: Autovacuum / full vacuum  (Christopher Browne, )
  Re: Autovacuum / full vacuum  (Michael Riess, )
   Re: Autovacuum / full vacuum  (Michael Stone, )
   Re: Autovacuum / full vacuum  (Andrew Sullivan, )
    Re: Autovacuum / full vacuum  (Scott Marlowe, )
     Re: Autovacuum / full vacuum  (Andrew Sullivan, )
      Re: Autovacuum / full vacuum  (Scott Marlowe, )
   Re: Autovacuum / full vacuum  (hubert depesz lubaczewski, )
   Re: Autovacuum / full vacuum  ("Jim C. Nasby", )
    Re: Autovacuum / full vacuum  (Michael Riess, )
     Re: Autovacuum / full vacuum  ("Jim C. Nasby", )
 Re: Autovacuum / full vacuum  (Andrew Sullivan, )
  Re: Autovacuum / full vacuum  (Michael Riess, )
   Re: Autovacuum / full vacuum  (Andrew Sullivan, )
 Re: Autovacuum / full vacuum  (Tom Lane, )
 Re: Autovacuum / full vacuum  (Chris Browne, )
  Re: Autovacuum / full vacuum  (Alvaro Herrera <-ip.org>, )
  Re: Autovacuum / full vacuum  (Andrew Sullivan, )
 Re: Autovacuum / full vacuum  (Chris Browne, )
  Re: Autovacuum / full vacuum  (Tom Lane, )
 Re: Autovacuum / full vacuum  ("Mindaugas", )
  Re: Autovacuum / full vacuum  (Alvaro Herrera <-ip.org>, )
 Re: Autovacuum / full vacuum  (Chris Browne, )
  Re: Autovacuum / full vacuum (off-topic?)  (Michael Crozier, )
   Re: Autovacuum / full vacuum (off-topic?)  ("Jim C. Nasby", )
    Re: Autovacuum / full vacuum (off-topic?)  (Michael Crozier, )
     Re: Autovacuum / full vacuum (off-topic?)  ("Jim C. Nasby", )
    Re: Autovacuum / full vacuum (off-topic?)  (Mark Kirkwood, )
     Re: Autovacuum / full vacuum (off-topic?)  (Bruce Momjian, )
     Re: Autovacuum / full vacuum (off-topic?)  ("Jim C. Nasby", )
      Re: Autovacuum / full vacuum (off-topic?)  ("Joshua D. Drake", )
       Re: Autovacuum / full vacuum (off-topic?)  ("Jim C. Nasby", )
        Re: Autovacuum / full vacuum (off-topic?)  ("Joshua D. Drake", )
         Re: Autovacuum / full vacuum (off-topic?)  ("Jim C. Nasby", )
 Re: Autovacuum / full vacuum (off-topic?)  (Chris Browne, )
  Re: Autovacuum / full vacuum (off-topic?)  (Michael Crozier, )
 Re: Autovacuum / full vacuum (off-topic?)  (<>, )
  Re: Autovacuum / full vacuum (off-topic?)  ("Jim C. Nasby", )

Hi,

yes, some heavily used tables contain approx. 90% free space after a
week. I'll try to increase FSM even more, but I think that I will still
have to run a full vacuum every week. Prior to 8.1 I was using 7.4 and
ran a full vacuum every day, so the autovacuum has helped a lot.

But actually I never understood why the database system slows down at
all when there is much unused space in the files. Are the unused pages
cached by the system, or is there another reason for the impact on the
performance?

Mike


 >  Have you measured to see if things are truly
> faster after a VACUUM FULL?
>
> Matt
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>


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