| From: | Oleg Broytmann <phd(at)comus(dot)ru> |
|---|---|
| To: | The Hermit Hacker <scrappy(at)hub(dot)org> |
| Cc: | hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] sorting big tables :( |
| Date: | 1998-05-21 06:12:50 |
| Message-ID: | Pine.LNX.3.96.SK.980521101037.16715C-100000@torus.comus.ru |
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| Thread: | |
| Lists: | pgsql-hackers |
Hello!
On Wed, 20 May 1998, The Hermit Hacker wrote:
> > 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).
>
> Okay, then we have two different understandings of this. My
> understanding was that the 10% reserve gave the OS a 'temp area' in which
> to move blocks to/from so that it could defrag on the fly...
No, you are wrong. This 10% is temp area reserved for emergent
situations - when root bring system down to single-user and do system
maintainance.
Oleg.
----
Oleg Broytmann http://members.tripod.com/~phd2/ phd2(at)earthling(dot)net
Programmers don't die, they just GOSUB without RETURN.
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