单项选择题

Inwhichscenariowillyouperformacancel－basedrecovery？（）

A.whenatablespaceisdroppedandyouhaveonlyRMAN-basedbackupofthedatabase
B.whenatableisdroppedandstoredintheRecycleBin
C.whenyouarerequiredtorecoveranexistingtabletoitspreviousstate
D.whenatablespaceisdroppedandyouhaveonlyauser-managedfullbackupofthedatabase
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单项选择题
YoutooktheDATA1tablespaceofflineat10：00A.M.At12：30P.M.，aschemaofauserisdroppedandpurgedfromtheRecycleBin.Younoticedthisat2：00P.M.anddecidedtoperformanincompleterecovery.Whichdatafileswillyourecover？（）
A.allthedatafilesinthedatabase
B.thedatafilesassociatedwiththeSYSTEMtablespace
C.thedatafilesassociatedwiththeDATA1tablespace
D.allthedatafilesinthedatabaseexceptthoseassociatedwiththeDATA1tablespace
单项选择题
YouareperforminganincompleterecoverybecausesomeimportanttableshavebeendroppedandpurgedfromtheRecycleBin.WhichclausecanyouNOTusetoperformtheincompleterecoverybyusingtheRMANutility？（）
A.UNTILCANCEL
B.UNTILSCN
C.UNTILSEQUENCE
D.UNTILTIME
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