Which three are true about the FLASHBACK DATABASE feature（）?
A、It always generates REDO and UNDO
B、It requires that the target database be in ARCHIVELOG mode
C、FLASHBACK DATABASE only uses FLASHBACK Logs to get the database to the desired flashback time
D、FLASHBACK LOGS are archived after a log switch
E、A database can be flashedback using SQI *PLUS
F、Queries and DML have the same FLASHBACK LOG overhead when flashback is enabled for a database

答案:ABE

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