От: Alvaro Herrera
Тема: Re: TRUNCATE TABLE
Дата: ,
Msg-id: 20070801151139.GE6165@alvh.no-ip.org
(см: обсуждение, исходный текст)
Ответ на: Re: TRUNCATE TABLE  (Adriaan van Os)
Список: pgsql-performance

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TRUNCATE TABLE  (Adriaan van Os, )
 Re: TRUNCATE TABLE  (Tom Lane, )
  Re: TRUNCATE TABLE  (Adriaan van Os, )
   Re: TRUNCATE TABLE  (Tom Lane, )
 Re: TRUNCATE TABLE  (Gregory Stark, )
  Re: TRUNCATE TABLE  (Adriaan van Os, )
   Re: TRUNCATE TABLE  (Gregory Stark, )
   Re: TRUNCATE TABLE  (Jean-Max Reymond, )
    Re: TRUNCATE TABLE  ("Thomas Samson", )
   Re: TRUNCATE TABLE  (Michael Stone, )
    Re: TRUNCATE TABLE  (Tom Lane, )
     Re: TRUNCATE TABLE  (Adriaan van Os, )
      Re: TRUNCATE TABLE  ("Steinar H. Gunderson", )
      Re: TRUNCATE TABLE  (Tom Lane, )
       Re: TRUNCATE TABLE  ("Jim C. Nasby", )
       Re: TRUNCATE TABLE  (Alvaro Herrera, )
        Re: TRUNCATE TABLE  ("Pavel Stehule", )
         Re: TRUNCATE TABLE  ("Jim C. Nasby", )
          Re: TRUNCATE TABLE  (Tom Lane, )
           Re: TRUNCATE TABLE  (Adriaan van Os, )
           Re: TRUNCATE TABLE  (Adriaan van Os, )
            Re: TRUNCATE TABLE  (Alvaro Herrera, )
           Re: TRUNCATE TABLE  ("Kevin Grittner", )
            Re: TRUNCATE TABLE  (Adriaan van Os, )
             Re: TRUNCATE TABLE  (Decibel!, )
              Re: TRUNCATE TABLE  (Tom Lane, )
       Re: TRUNCATE TABLE  (Adriaan van Os, )

Adriaan van Os wrote:
> Tom Lane wrote:
>
>> Somehow, autovac is doing something that makes the filesystem go nuts
>> every so often, and take an astonishingly long time to create an empty
>> file.  But autovac itself doesn't create or delete any files, so what's
>> up here?
>> Also, I was able to reproduce the variability in timing on HPUX and
>> Darwin as well as Linux, so we can't put all the blame on ext3.
>> (I didn't drill down to the strace level on the other two machines,
>> though, so it's possible that there is a different mechanism at work
>> there.)
>
> Any news since this message ? Should I file a bug report ?

Were you able to show that turning off autovacuum removes the
performance problem?

--
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support


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