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Your database is functioning in ARCHIVELOG mode. In which two situations would you perform a cancel/x7fbased recovery？（）
A:You find that one of the redo log members in each redo log group is lost.
B:You find that a data file that belongs to the USERS tablespace is damaged.
C:You find that a data file that belongs to the SYSTEM tablespace is damaged.
D:You find that the current redo log group is damaged and is not available for recovery.
E:You realized while performing a recovery that an archived redo log file needed for recovery is lost.

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出自：Oracle认证

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