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單項(xiàng)選擇題

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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