单项选择题 YouaremanagingasingleinstanceOracle10gdatabasethatutilizesthefollowingparameters：WhichofthefollowingsetofcommandsmustyouexecutetoenableFlashbackDatabase？（）

单项选择题 Youareperformingadatabaserecoverybecauseauser’sschemaisdropped.Whileperformingtherecovery，youusetheUNTILSEQUENCEclause.Whichtypeofdatabaserecoveryareyouperforming？（）

单项选择题 You are performing an incomplete recovery because a tablespace is dropped and purged from the Recycle Bin. In which mode will you execute the following code？（）  RMAN>RUN  {   SET UNTIL SEQUENCE  THREAD ；   RESTORE DATABASE；   RECOVER DATABASE；  }