Differance between Rollback Segements and Undo Tablespace/segments

Hi everyone.
I have some confusion that how Rollback Segements and Undo Tablespace/segments and different? Functionally they seem to be the same but why then Oracle recommends not using Rollback segments?...please explain. Kindly post any links useful in this regard.
Thanks,
Mukesh

1.when does the changed data written to the undo tablespace?It never gets moved to the undo tablespace.
The ORIGINAL data gets moved to the rollback/undo. Oracle assumes that most of the time the transaction is going to commit, so the change is made to the real block (in memory). At that time, enough information to roll back that change is written into the rollback segment.
2.which process writes the changed data to the undo tbs?The server process. The one to which the user connects. The one the user gets by contascting the listener.
3.What are the identifiactions which is used to undo the changes made(like SCN) ? plz...AFAIK, Transaction Id is the only thing used. SCN, a redo log construct, may be used to recreate the transaction ID in the rollback.

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Message was edited by:
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As Jonathan said, shrinking segment generates redo and undo data.
But, this phoenomenon of undo shortage is not normal case.
Shrinking segment might invole continous DML(deleting and re-inserting),
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Differance between Rollback Segements and Undo Tablespace/segments

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