YouworkasadatabaseadministratorforSupportcenter.cn.Youreceivedthefollowingerrorwhileworkingonyourdatabase:ORA－01555:snapshottooold,Inwhichsituationwouldyoureceivesuchanerror?() A.Youperformedrollbackaftercommit.B.Ifalogswitchoccursinyourdatabase.C.Thearchiverfailstogenerateanarchivedlogfile.D.Instancerecoveryfailstofindoneoftheredologfiles.E.Along-runningqueryisunabletogetread-consistentimage.F.Ifyouperformmanualundomanagementoperationsinautomode.
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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ORA-01555的应对方法？