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Why would you run the delete obsolete command？（）  
A: To remove missing backup set pieces physically from disk
B: To remove metadata related to backup set pieces in the control file and the recovery catalog
C: To mark as deleted records in the control file and the recovery catalog associated with obsolete backup sets
D: To delete backup set pieces associated with backups that are no longer needed due to retention criteria
E: To remove old versions of RMAN backups

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出自：Oracle认证

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