Yourdatabaseinstanceisfunctionalforthepastonemonth.TheAutomaticWorkloadRepository（AWR）snapshotretentionissetto7andtheSTATISTICS_LEVELinitializationparameterissettoTYPICAL.Youreceiveacomplaintaboutthepoorperformanceofthedatabasebetween7PMand9PMofthepreviousday.Choosetwoactionsanyofwhichcanbereferredtofirsttodiagnosetheproblem.（）
A.UsetheActiveSessionHistoryreport.
B.UsetheAWRComparePeriodsreport.
C.UseanADDManalysisbetween7PMand9PMofthepreviousday.
D.UsetheAWRComparePeriodreportbetween7PMand9PMofthepreviousday.
正确答案：参考B, C
