Oracle9i How to convert from undo tables to rollback segments

Hi,
Anyone try before converting from UNDO management to using rollback segment....What are the procedures for the conversion...
Thank You...

Hi,
Follow these steps to convert from Auto UNDO to Rollback Segs....
1. With the database opened, create a rollback tablespace and then create some rollback segments and bring them online like this
CREATE ROLLBACK SEGMENT RBS1 TABLESPACE RBS;
ALTER ROLLBACK SEGMENT RBS1 ONLINE;
2. Then edit the PFILE and modify these parameters
Add: ROLLBACK_SEGMENTS=(RBS1,RBS2,RBS3....)
Comment: UNDO_MANAGEMENT=AUTO and UNDO_TABLESPACE=UNDOTBS or whatever name you have for your UNDO tablespace.
3. Shutdown the database gracefully(normal).
4. Startup pfile=<Pfile path>
5. Sync these new parameter changes to the SPFILE by recreating the SPFILE.
6. Take a full level 0 backup of your database as the structure has changed.
The next time you start the database, it will use the SPFILE which is same as the PFILE.
Regards.

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I have read the following, but am still having a little difficulty conceptualising. Would someone be kind enough to give me a very brief example?
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For each rollback segment, Oracle maintains a transaction table--a list of all transactions that use the associated rollback segment and the rollback entries for each change performed by these transactions.

First of all, the statement is talking about old manual undo management using rollback segment.
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Oracle9i How to convert from undo tables to rollback segments

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