【多选题】
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 SQL*PLUS
F Queries and DML have the same FLASHBACK LOG overhead when flashback is enabled for a database
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