Undo Tablespace ..Is it the most important part of recovery

I just got a doubt
Redologs files are filles with COMMITED AND UNCOMMTTED transactions and archived assume archive log
ORacle uses undo tablespace to rollback the uncommited transactions
What happens if we loose undo tablespace?
sunday i took full backup...
after eactly one menoth i take another full backup meant time somewhere in the middle of the month i database crashes and also undo tablespace lost
how ill oracle recover in this scenario
Message was edited by:
Maran Viswarayar

In your sceniario, you have a Big problem here. Without a proper backup of your undo tablespace, you are going to suffer data loss if there're active undo segments.
Check Metalink Doc ID: Note:28812.1
Rollback Segment Needs Recovery
You need to drop all objects to release active undo segments.
There's a work around floating around like list all corrupted rollback segment in undocumented initial parameter
*._corrupt_rollback_segments=”_SYSSMU29$” I won't recommended this method , because it didn't fix the problem. It validated uncommited data.

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