Advantage for use undo_management MANUAL oracle 9i DWH

Hi,
I have a questions,
What is the advantage for use undo_management MANUAL oracle 9i in DWH vs undo_management AUTO?
I need to obtain the UNDO_BLOCK_PER_SEC, but when I try to obtain the information in the view v$undostat, appear "no rows selected", exist any form to obtain this information?
Thanks for your help!!
Regards!!

To add to what SB said, do not tune what does not need tuning. That is, do not make changes till you have developed a case to support the change.
In order to learn how to work with rollback segments look in your DBA Administration manual. Since Oracle now puts the emphasis on automatic undo management I would look for an earlier version of the documentation set and reference it since there is probably more information in the manual where manual RBS management was the only method.
If you are a warehouse I would expect the number of users performing DML to be low and the update jobs to be large so I would expect a low number of large RBS segments to be allocated.
HTH -- Mark D Powell --

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