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You run the following commands：   RMAN> list expired backup； RMAN> delete expired backup；   What will happen to the backup set pieces associated with the backups that appear in the list expired backup command？（）  
A: They will be renamed.
B: Nothing will happen to them. The backup set pieces do not exist.
C: They will be deleted immediately since they are not in the flash recovery area.
D: You will need to manually remove the physical files listed in the output of the commands.
E: They will become hidden files and removed 10 days later.

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出自：Oracle认证

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