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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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UserAexecutesthefollowingcommandtodropalargetableinyourdatabase：SQL>DROPTABLEtrans；Whilethedroptableoperationisinprogress，userBexecutesthefollowingcommandonthesametable：SQL>DELETEFROMtransWHEREtr_type=’SL’；WhichstatementistrueregardingtheDELETEcommand（）
A.Itfailswitha"ResourceBusy"error.
B.ItdeletestherowssuccessfullybecausethetableislockedinSHAREmode.
C.ItfailstodeletetherecordsbecausethetableislockedinEXCLUSIVEmode.
D.ItdeletestherowssuccessfullybecausethetableislockedinSHAREROWEXCLUSIVEmode.

A.Itfailswitha"ResourceBusy"error.
B.ItdeletestherowssuccessfullybecausethetableislockedinSHAREmode.
C.ItfailstodeletetherecordsbecausethetableislockedinEXCLUSIVEmode.
D.ItdeletestherowssuccessfullybecausethetableislockedinSHAREROWEXCLUSIVEmode.
单项选择题

Youissuedthefollowingcommand：ALTERTABLE&en
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