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  Home > Publications >

  Automatic Undo Internals (June-2003)
 

 
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Product Code: UNDO

Description
 
Automatic Undo Management (AUM), also referred to as System Managed Undo (SMU), was introduced in Oracle9i in response to performance 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. This paper is based upon many hours of research including block dumps and numerious experiments.
 


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