YouworkasadatabaseadministratorforSupportcenter.cn.Youreceivedthefollowingerrorwhileworkingonyourdatabase:ORA－01555:snapshottooold,Inwhichsituationwouldyoureceivesuchanerror?()A.Youperformedrollbackaftercommit.B.Ifalogswitchoccursinyourdatabase.C.Thearchi

题目
YouworkasadatabaseadministratorforSupportcenter.cn.Youreceivedthefollowingerrorwhileworkingonyourdatabase:ORA－01555:snapshottooold,Inwhichsituationwouldyoureceivesuchanerror?()

A.Youperformedrollbackaftercommit.

B.Ifalogswitchoccursinyourdatabase.

C.Thearchiverfailstogenerateanarchivedlogfile.

D.Instancerecoveryfailstofindoneoftheredologfiles.

E.Along-runningqueryisunabletogetread-consistentimage.

F.Ifyouperformmanualundomanagementoperationsinautomode.

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