（单选题）
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
正确答案
答案解析
略
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