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You executed the following command in the Recovery Manager （RMAN）：   RMAN> REPORT NEED BACKUP days 3；   What is the output of this command？（）  
A: A list of files that require a backup within 3 days
B: A list of files requiring more than 3 days of archivelogs to apply
C: A list of files that RMAN recommends be backed up only once in every three days，based on low volatility
D: A list of files for which a backup as already been performed in the last three days and which is  required to be backed up again based on the high number of transactions performed on them

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出自：Oracle认证

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