多选题What two are the prerequisites for enabling Flashback Database?（）AThe database must be in ARCHIVELOG modeBThe database must be in MOUNT EXCLUSIVE modeCThe database must be opened in RESTRICTED modeDThe database instance must be started in the NOMOUNT stateEThe database instance must have the keep buffer pool defined
多选题
What two are the prerequisites for enabling Flashback Database?（）
A
The database must be in ARCHIVELOG mode
B
The database must be in MOUNT EXCLUSIVE mode
C
The database must be opened in RESTRICTED mode
D
The database instance must be started in the NOMOUNT state
E
The database instance must have the keep buffer pool defined
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