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多项选择题User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA, which commands must you execute to enable SCOTT to flash back the transactions?（）

A、ALTER DATABASE FLASHBACK ON;

B、GRANT SELECT any transaction TO scott;

C、GRANT EXECUTE ON dbms_flashback TO scott;

D、ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;

E、ALTER TABLESPACE undots1 RETENTION GUARANTEE;

F、ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS;

  • B,C,D,F

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