（多选题）
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.
正确答案
答案解析
略
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