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A.Putthedatabaseinhotbackupmodeandperformanonlinebackup，includingbackingupthearchivedredologs.
B.Justbackupthedatabasedatafileswithoutshuttingdownthedatabase.
C.Youwillhavetowaituntilyoucanshutdownthedatabasetoperformthebackup.
D.Markeachdatafileasbackupinprogress，backthemupindividually，andthenmarkthemasbackupnotinprogress.Noarchivedredologswillneedtobebackedup.
E.Onlybackupthedatafilesthattheuserwillnotbetouching.Oncetheuserhasfinishedwhattheyweredoing，youcanshutdownthedatabaseandbackupthedatafilestheuserchangedduringthecourseoftheremainingbackup

A.Whenthedatafileoftheundotablespaceisautoextensible
B.Whentherearemorethanoneundotablespacesavailableinthedatabase
C.Whentheundotablespaceisofafixedsizeandretentionguaranteeisnotenabled
D.Whentheundotablespaceisautoextensibleandretentionguaranteeisnotenabled