Re: [HACKERS] sorting big tables :( - Mailing list pgsql-hackers

On Wed, 20 May 1998, The Hermit Hacker wrote:

>     One of the things that the Unix FS does is auto-defragmenting, at
> least the UFS one does.  Whenever the system is idle (from my
> understanding), the kernel uses that time to clean up the file systems, to
> reduce the file system fragmentation.

  No, that doesn't happen.  The only way to eliminate fragmentation is a
dump/newfs/restore cycle.  UFS does do fragmentation avoidance (which is
reason UFS filesystems have a 10% reserve).

Tom