多项选择题
A.Use the Active Session History report.
B.Use the AWR Compare Periods report.
C.Use an ADDM analysis between 7 PM and 9 PM of the previous day.
D.Use the AWR Compare Period report between 7 PM and 9 PM of the previous day.
多项选择题 WhichtwostatementsaretrueabouttheAutomaticDatabaseDiagnosticMonitor（ADDM）（）
单项选择题 WhichstatementistrueabouttheManageabilityMonitor（MMON）backgroundproces（）
单项选择题 Your database is functional with a peak load for the last one hour. You want to preserve theperformance statistics collected during this period to be used for comparison when you analyze theperformance of the database in the future. What action would you take to achieve this task（）