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Which two are prerequisites for performing a flashback transaction?（）
A:Flashback Database must be enabled.
B:Undo retention guarantee for the database must be configured.
C:EXECUTE privilege on the DBMS_FLASHBACK package must be granted to the user flashing back transaction.
D:Supplemental logging must be enabled.
E:Recycle bin must be enabled for the database.
F:Block change tracking must be enabled tor the database.

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出自：Oracle认证

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