Rajendra Jamadagni MIS, ESPN Inc.
Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.
QOTD: Any clod can have facts, but having an opinion is an art!
-----Original Message-----
From: Loughmiller, Greg [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 19, 2002 3:08 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: 9i / 9iRAC : Segment_Space_Management AUTO, with LOB:-0Our ASS managment does a lot of thrashing lately...It's close enuf to Friday and a 2 week vacation as well.....-----Original Message-----
From: Koivu, Lisa [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 19, 2002 2:30 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: 9i / 9iRAC : Segment_Space_Management AUTO, with LOBASS Management? I'm snickering, I know it's juvenile humor, but... LOL! Let me tell you, my ASS is not on the Free List. And thrashing? I'll leave that one alone!
Sorry everyone. Couldn't resist. Is it Friday yet...
-----Original Message-----
From: Jonathan Lewis [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 19, 2002 1:56 PM
To: Multiple recipients of list ORACLE-L
Subject: Re: 9i / 9iRAC : Segment_Space_Management AUTO, with LOB
Depending on your circumstances, ASS Management
can eliminate severe contention on the freelists / freelist
groups area. However, because Oracle is overgenerous
with its allocation of bitmap blocks (which may turn
out to be in excess of 1% of your database), you
may end up thrashing your system because most of
your buffer space is flooded with hot BMBs and the
data has to keep thrashing on and off disk.Regards
Jonathan Lewis
http://www.jlcomp.demon.co.ukComing soon a new one-day tutorial:
Cost Based Optimisation
(see http://www.jlcomp.demon.co.uk/tutorial.html )Next Seminar dates:
(see http://www.jlcomp.demon.co.uk/seminar.html )____England______January 21/23
The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
-----Original Message-----
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
Date: 19 December 2002 17:51
>We were the other way around in our testing lately:-)
>
>We turned on auto space management to remove the contention.
Afterwards-we
>removed quite a bit of header block/free list contention..
>
>anyway, more tests to follow
>
>-----Original Message-----
>Sent: Thursday, December 19, 2002 10:09 AM
>To: Multiple recipients of list ORACLE-L
>
>
>
>As part of a RAC benchmark with 9.2 we had faced severe LOCKING
>on setting segment space management AUTO & had to REMOVE it
>
>HTH
>
--
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--
Author: Jonathan Lewis
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