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Learn Internals of Oracle Automatic Undo Management

Daniel Fink has published his excellent whitepaper “Automatic Undo Internals” here:

 

http://www.optimaldba.com/AutomaticUndoInternals.pdf 

 

Automatic Undo Management (AUM), also referred to as System Managed Undo (SMU), was introduced in Oracle9i in response to performance and administrative difficulties associated with rollback segments.

 

AUM is widely publicized in marketing materials. However, there is little actual documentation on the mechanics and management of automatic undo from a DBA's perspective. This paper will shed light on the actual operations of automatic undo management.
 


 

 
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