Whichcommandisusedtobeginatablespacepoint-in-timerecovery？（）
A. Restoretablespace
B. Recovertablespace
C. Tablespacerecover
D. Recovertotime
E. recoverdatafile
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下列哪一些交通工具属于新事物（）
A. 飞机
B. 高铁
C. 动车
D. 轻轨
E. 自行车
WhichofthefollowingisavalidwayofputtingatablespacenamedDAVE_TBSintohotbackupmode？（）
A. altertablespaceDAVE_TBSbackupmode
B. altertablespaceDAVE_TBSstartbackup
C. altertablespaceDAVE_TBSbeginbackup
D. altertablespaceDAVE_TBSbackupbegin
E. altertablespaceDAVE_TBSbackup
Which four are valid Oracle constraint types？ （）
A. CASCADE
B. UNIQUE
C. NONUNIQUE
D. CHECK
E. PRIMARY KEY
F. CONSTANTG. NOT NULL
Youhaveadiskgroup，DGROUP1，withthreedisksandNORMALredundancy.Youexecutethefollowingcommandtocreateatemplateforthediskgroup：ALTERDISKGROUPdgroup1ADDTEMPLATEmy_tempATTRIBUTES（MIRRORFINE）；Whichstatementistrue？（）
A. WhenafileiscreatedinDGROUP1withthetemplate，itwouldhavethree-waymirroring.
B. WhenafileiscreatedinDGROUP1，theMY_TEMPtemplatebecomesthedefaulttemplate.
C. WhenafileiscreatedinDGROUP1withthetemplate，itwouldhavetwo-waymirroringandfilestriping.
D. WhenafileiscreatedinDGROUP1withthetemplate，itwouldhavethree-waymirroringandfilestriping.
E. WhenafileiscreatedinDGROUP1withthetemplate，itwouldhavetwo-waymirroringbutnofileStriping.
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