oracle 关闭数据字典访问权限需要执行的命令为:(____)。

A.alter system set O7_DICTIONARY_ACCESSIBILITY=0 scope=spfile;

B.alter system set O7_DICTIONARY_ACCESSIBILITY=FALSE scope=spfile;

C.alter system set O7_DICTIONARY_ACCESSIBILITY=null scope=spfile;

D.alter system set O7_DICTIONARY_ACCESSIBILITY=none scope=spfile;

正确答案是B

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