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If a backup set is expired， what can you do to correct the problem？（）  
A: Change the retention criteria.
B: Make the lost backup set pieces available to RMAN again.
C: Run the crosscheck command to correct the location for the backup set piece contained in the metadata.
D: Nothing. The backup set piece is lost forever.
E: Call Oracle support，their assistance is required.

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出自：Oracle认证

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