A. FLASHBACK transaction query requires undo to retrieve all versions of a row that existed between two points in time. B. FLASHBACK drop requires that the RECYCLEBIN ...

Describe the feature you'd like to propose: Flashback enables viewing or restoring data as it existed at a past point in time—without requiring traditional backup and restore.

Abstract: To address the data security issues of AS/RS, the Oracle flashback technology was applied to the system data security protection method. An AS/RS data security strategy was established, and ...