Undo Advisor(OEM)

 

You can use Undo Advisor to set UNDO_RETENTION and the required undo tablespace size.

You can open the Undo Advisor using the Database-> Diagnose-> Undo Advisor (OEM) tabs via TOAD as follows.

 

You can alter the existing Undo tablespace as follows.

 

You can change the undo retention time as follows.

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