Re: good pc but bad performance,why?

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От Bruce Momjian
Тема Re: good pc but bad performance,why?
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Msg-id 200404072212.i37MCck07003@candle.pha.pa.us
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Ответ на Re: good pc but bad performance,why?  ("scott.marlowe" <scott.marlowe@ihs.com>)
Ответы Re: good pc but bad performance,why?  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-performance
scott.marlowe wrote:
> > One thing I recommend is to use ext2 (or almost anything but ext3).
> > There is no real need (or benefit) from having the database on a
> > journalled filesystem - the journalling is only trying to give similar
> > sorts of guarantees to what the fsync in PostgreSQL is doing.
>
> Is this true?  I was under the impression that without at least meta-data
> journaling postgresql could still be corrupted by power failure.

It is false.  ext2 isn't crash-safe, and PostgreSQL needs an intact file
system for WAL recovery.

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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