RE: Altering Freelist Groups in 10gR2 ?

Mladen, Jonathan

Also faced a Similar issue at a High End Benchmark with 10gR2 touching
about 20,000 TPS. Respective Tables undergoing INSERTs had to be moved
from ASSM to NON-Assm Tablespaces.

Jonathan - Your assumption is Correct. Database currently exists in 9.2
& most objects have freelists = 99. DB also needs to be migrated to
10.2.

HTH

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jonathan Lewis
Sent: Wednesday, September 27, 2006 6:30 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Altering Freelist Groups in 10gR2 ?

I know, but based on the comments (a) he needs to
make the change, and (b) he has a 3TB database,
I assume the OP has migrated from an earlier version
and has data in free-list managed, rather than page-table
managed tablespaces.

ASSM is approximately equivalent to freelists 16 as
it seems to format 16 blocks at a time when space
is required.  I have seen two systems recently which
were suffering from serious buffer busy waits because
of this limit. (Both 10.2.0.1)

A strategy error in the code means that ASSM can
still fail to maintain the bitmaps properly - you can
get data blocks which should be marked as full in
the bitmap being constantly checked and discarded
by processing attempting inserts; you can get data
blocks with space in them being left as 'FULL'
because of concurrent actions on the block, and
only one of those actions being reflected in the
bitmap.


Regards

Jonathan Lewis


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