Re: undo segments vs. rbs
- From: Mladen Gogala <mladen@xxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 18 May 2004 17:15:48 -0400
Well, I suggest you to have one LMT with uniform extent size of 67108864 bytes
and forget about sizing and re-sizing. To save you the trouble of calculating
64*1048576=67108864. Nothing like the binary numbers, don't you agree? I mean,
if 10M is a large extent, 64M would probably be considered humongous and would
solve all your problems. As Oracle is NOT caching extents (a very persistent
fairy tale, with the same amount of truth as Cinderella, Sleeping Beauty or Red
Riding Hood) you will not see any difference in performance. What you will also
stop
seeing are the coveted ORA-01555 messages. God knows when did I see my last one?
It makes me so nostalgic.
On 05/18/2004 04:34:15 PM, Paula_Stankus@xxxxxxxxxxxxxxx wrote:
> I am working on moving a productional database from 8.0.6 to 9i. I have =
> a question: if I have 10 rbs at 128K (initial and next extent) and one =
> "large" on at 10,485,760 bytes how does that translate into undo =
> segments? =20
>
> Are there any best practices on sizing undo segments?
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--
Mladen Gogala
Oracle DBA
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