> On Sun, 24 Jun 2001, Bruce Momjian wrote:
>
> > > Oh yeah,
> > > vacuuming is not the problem here.
> > >
> > > Thanks anyway... :)
> > >
> > > And also, it seems that it is the indexed searches that is suffering the
> > > most. The non-indexed searches is less affected. This is not only PostgreSQL
> > > but also MySQL.
> >
> > I know the BSD filesystems are self-defragmenting. I don't know if the
> > ext2 filesystems are the same. Surely someone must know.
> Not exactly, BSD ffs (fast filesystem) isn't self-defragmenting, it just
> fragments differently [less than] ext2 :)
Yes, BSD is more "doesn't fragment much" rather than "self
defragmenting".
> See this for paper and some tools to get ffs fragmentation stats:
> http://www.eecs.harvard.edu/~margo/usenix.195
> (it has links to critique of the paper as well)
>
> There's a tool ftp://ftp.uk.linux.org/pub/linux/sct/defrag/ to defrag ext2
> filesystem, but its considered to be alpha quality and not really
> maintained.
Yes, thanks for the clarification.
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 853-3000
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