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Why would you execute the report obsolete command？（）  
A: To list all backups that were no longer available for restore operations
B: To list all backups that had aged beyond the RMAN retention criteria
C: To list all backup set pieces listed in control-file or recovery-catalog metadata that are not on the backup media
D: To list all datafiles that are no longer part of the database and thus do not need to be backed up
E: To list all archived redo logs that are no longer needed for any database recovery

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出自：Oracle认证

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