What are the prerequisites for performing flashback transactions? （）(Choose all that apply)
- A、Supplemental log must be enabled
- B、Supplemental log must be enabled for the primary key
- C、Undo retention guarantee for the database must be configured
- D、”EXECUTE “ permission on the DBMS_FLASHBACK package must be granted to the user
正确答案:A,B,D
答案解析:有
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