单项选择题 Which of the following statements is true regarding the initialization parameter DIAGNOSTIC_DEST？（）   The default value is the value of the environment variable $ORACLE_HOME； if $ORACLE_HOME isn’t set

多项选择题 WhichofthefollowinginitializationparametershavebeendeprecatedinOracle11gbecauseoftheintroductionoftheAutomaticWorkloadRepository？（）

单项选择题 TocleanupoldrecordsthatareinaFlashbackDataArchiveandarepasttheretentionperiod，whatmusttheDBAdo？（）