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What are the prerequisites for enabling Flashback Database？ （）
A: The database must be started in the MOUNT EXCLUSIVE state.
B: The database must have multiplexed control files.
C: The database must be opened by using a text-based parameter file instead of a server parameter file （SPFILE）.
D: The database must be in ARCHIVELOG mode.
E: The database must be in the NOMOUNT state.
F: The database must be opened in RESTRICTED mode.

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出自：Oracle认证

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