Question:For what purpose is the initialization parameter UNDO_RETENTION used? 

A To specify the length of time Oracle must retain undo data in the undo tablespace 
B To specify the length of time Oracle must retain undo data in the flash recovery area 
C To specify the length of time Oracle must retain undo data in the data files 
D To specify the length of time Oracle will retain undo data in the flashback database logs 

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B 

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Md. Habib Ullah

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