单选题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.
单选题
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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