The version query pseudocolumns are valid only in Oracle Flashback Version Query, which is a form of Oracle Flashback Query. The version query pseudocolumns are: VERSIONS_XID: Identifier (a RAW number ...

FLASHBACK DATABASE for information on reverting the entire database to an earlier version the flashback_query_clause of SELECT for information on retrieving past data from a table Oracle Database ...

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 ...