题目内容
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[单选题]
MySQL5.5开始新增的数据库performance_schema主要用于()。
A.存储information_schema数据库的辅助信息
B.收集数据库服务器性能参数,可用于数据库服务器的监控和优化
C.存储数据库的所有数据字典
D.存储数据库的逻辑结构
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A.存储information_schema数据库的辅助信息
B.收集数据库服务器性能参数,可用于数据库服务器的监控和优化
C.存储数据库的所有数据字典
D.存储数据库的逻辑结构
UES('2018001','孙悟空','男')。()
tsVALUES('2018001','孙悟空','男')。()
A.They performed mainly in Europe.
B.They imitated the techniques of ballet.
C.They performed to classical music.
D.Their works had no formal structure.
学号,姓名,性别,专业)VALUES('2018001','孙悟空','男')。()
The primary purpose of obedience training is to ________.
A) teach the dog to perform. clever tricks
B) make the dog aware of its owner’s authority
C) provide the dog with outlets for its wild behavior
D) enable the dog to regain its normal behavior