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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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