单项选择题

A.Youneedtoensurethatwiththesameworkloadyoushouldbeabletoflashbacktablesbythreehours.Whatwouldyoudotofindthesystemrecommendationsfortheundoretentionperiodandtheundotablespacesize?()
A.setDB_FLASHBACK_RETENTION_TARGET=10800
B.createanewschedulerwindowforthetimeperiodof24hoursandusetheoptimizerstatistics
C.modifytheAutomaticWorkloadRepository(AWR)snapshottimeintervaltothreehoursanduseADDMfindings
D.specifyNewUndoRetentionasthreehoursandAnalysisTimeperiodasLastOneDayintheUndoAdvisorpageanduseitsrecommendations
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