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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

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出自：Oracle认证

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