单项选择题
A.V$SESSION_EVENT
B.V$SESSION
C.V$W0041ITS
D.V$WAITSTAT
E.V$SESSION_LONGOPS
单项选择题 Whatdoesitmeanifabackupisexpired?（）
单项选择题 Youwanttomakesurethatyourdatabasebackupdoesnotexceed10hoursinlength.Whatcommandwouldyouissuethatwouldmeetthiscondition?（）
单项选择题 ouhavebackedupyourdatabasetwicewithoutconnectingtotherecoverycatalog.Whatcommanddoyouissuetotransferthecontrol-filemetadatatotherecoverycatalog?（）