多项选择题
A.ALL
B.PFILE
C.BOTH
D.NONE
E.SPFILE
F.MEMORY
G.INSTANCE
H.DATABASE
单项选择题 Youhavethreedatabases，FINDB，PAYDBandADMINDB，locatedinSydney，TokyoandSingaporerespectively.Youwanttoperformadministrativetaskswhichincludestartingupandshuttingdownthedatabases，creatingandmanagingtablespacesanddatabaseusers，andtakingregularbackups，forallofthethreedatabasesfromLondon.Whichcomponentmustbeenabledandrunningoneachhostmachinetoachieveyourobjective？（）
单项选择题 YouareusingthebackupschedulerinEnterpriseManager（EM）toscheduleabackupofyourdatabase.Whichtypeofscriptdoesthebackupschedulergenerate？（）
多项选择题 Exhibit： View the Exhibit to see the data in the emp table. You created a PRIMARY KEY constraint on the empno column of the emp table， and the constraint is not deferred. Which two statements are true in this scenario？ （）