多选题You need to ensure that the database users should be able to use the various flashback query features in order to go back in time by four hours. What would you do to achieve this?（）Aset SQL_TRACE=TrueBset UNDO_RETENTION=14400Cset FAST_START_MTTR_TARGET=240Dset LOG_CHECKPOINT_INTERVAL=240Eset DB_FLASHBACK_RETENTION_TARGET=14400Fset the RETENTION GUARANTEE clause for the undo tablespace
多选题
You need to ensure that the database users should be able to use the various flashback query features in order to go back in time by four hours. What would you do to achieve this?（）
A
set SQL_TRACE=True
B
set UNDO_RETENTION=14400
C
set FAST_START_MTTR_TARGET=240
D
set LOG_CHECKPOINT_INTERVAL=240
E
set DB_FLASHBACK_RETENTION_TARGET=14400
F
set the RETENTION GUARANTEE clause for the undo tablespace
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