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Home -> Community -> Mailing Lists -> Oracle-L -> Re: undo tablespace
David,
I would start with 11gb as my undo tablespace size. You may be over/under allocated, but that can be adjusted as time goes by. You can use multiple datafiles for the undo tablespace. The syntax is the same as the multiple file tablespace.
A word of warning, automatic undo is not a good choice for a high volume oltp system. What is the highest # of concurrent transactions and the average transaction duration & change (in bytes) for this db?
Regards,
Daniel Fink
"Ehresmann, David" wrote:
> I have a rollback segment tablespace that is 11Gb composed of 11 datafiles
> spread over 3 filesystems on hp in 8i. I am building a new 9i db for this
> instance and want to use an undo tablespace. I have created 9i dbs before
> with undo tbs. I have used/read about the retention period and size. But
> never anything of this size. I am taking this over from a previous dba. My
> question is if I have an 11Gb rbs tablespace what does that translate to in
> an undo tablespace? This is a claims processing database. Can you use
> multiple datafiles in an undo tablespace? I have never seen examples
> referenceed with multiple datafiles in an undo tablespace.
>
> thanks,
>
> David Ehresmann
>
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