单项选择题
Which of the following is a valid way of putting a tablespace named DAVE_TBS into hot backup mode?（）
A.alter tablespace DAVE_TBS backup mode
B.alter tablespace DAVE_TBS start backup
C.alter tablespace DAVE_TBS begin backup
D.alter tablespace DAVE_TBS backup begin
E.alter tablespace DAVE_TBS backup
单项选择题 Whichcommandwillresultinatracefilebeingcreatedwiththecreatecontrolfilecommandcontainedinit?（）
单项选择题 hichofthefollowingRMANstructurescandatafromadatafilespan?（）
单项选择题 Youcreatetworesourceplans,onefordatawarehouseloadingjobsatnightandtheotherforapplicationjobsatdaytime.Youwanttheresourceplanstoactivateautomaticallysothattheresourceallocationisoptimumasdesiredbytheactivity.Howwouldyouachievethis?（）