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.
正确答案:B,C
答案解析:有
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