(one more time) Patches with vacuum fixes available.

I know you guys are pretty busy with the upcoming release but I
was hoping for more interest in this work.

With this (which needs forward porting) we're able to cut
vacuum time down from ~10minutes to under 30 seconds.

The code is a nop unless you compile with special options(MMNB)
specify the special vacuum flag (VLAZY) and doesn't look like it
messes with anything otherwise.

I was hoping to see it go into 7.0.x because of the non-intrusiveness
of it and also because Vadim did it so he should understand it so
that it won't cause any problems (and on the slight chance that it
does, he should be able to fix it).

Basically Vadim left it up to me to campaign for acceptance of this
work and he said he wouldn't have a problem bringing it in as long
as it was ok with the rest of the development team.

So can we get a go-ahead on this? :)

thanks,
-Alfred

----- Forwarded message from Alfred Perlstein <bright(at)wintelcom(dot)net> -----

From: Alfred Perlstein <bright(at)wintelcom(dot)net>
To: pgsql-hackers(at)postgresql(dot)org
Subject: [HACKERS] Patches with vacuum fixes available for 7.0.x
Date: Thu, 7 Dec 2000 14:57:32 -0800
Message-ID: <20001207145732(dot)X16205(at)fw(dot)wintelcom(dot)net>
User-Agent: Mutt/1.2.5i
Sender: pgsql-hackers-owner(at)postgresql(dot)org

We recently had a very satisfactory contract completed by
Vadim.

Basically Vadim has been able to reduce the amount of time
taken by a vacuum from 10-15 minutes down to under 10 seconds.

We've been running with these patches under heavy load for
about a week now without any problems except one:
don't 'lazy' (new option for vacuum) a table which has just
had an index created on it, or at least don't expect it to
take any less time than a normal vacuum would.

There's three patchsets and they are available at:

http://people.freebsd.org/~alfred/vacfix/

complete diff:
http://people.freebsd.org/~alfred/vacfix/v.diff

only lazy vacuum option to speed up index vacuums:
http://people.freebsd.org/~alfred/vacfix/vlazy.tgz

only lazy vacuum option to only scan from start of modified
data:
http://people.freebsd.org/~alfred/vacfix/mnmb.tgz

Although the patches are for 7.0.x I'm hoping that they
can be forward ported (if Vadim hasn't done it already)
to 7.1.

enjoy!

--
-Alfred Perlstein - [bright(at)wintelcom(dot)net|alfred(at)freebsd(dot)org]
"I have the heart of a child; I keep it in a jar on my desk."

----- End forwarded message -----

--
-Alfred Perlstein - [bright(at)wintelcom(dot)net|alfred(at)freebsd(dot)org]
"I have the heart of a child; I keep it in a jar on my desk."