（多选题）
You can use Oracle Flashback to look at past activity in your database. What are two other characteristics of Oracle Flashback？（）
AOracle Flashback uses undo information to construct consistent data.
BYou can use a cursor opened while using an Oracle Flashback image to perform DML once you deactivate Oracle Flashback in your session.
CYou can only use Oracle Flashback view of the data if the required records are still in the online redo log files.
DOracle Flashback lists the DML that was executed during the period you identify when initiating your session.
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