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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

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出自：Oracle认证

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