题目内容

判断题 Each row in a relation is called a tuple. ( ) 对 ( ) 错

A. 对
B. 错

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判断题 The number of rows in a relation is its cardinality. ( ) 对 ( ) 错

A. 对
B. 错

判断题 In a fragmented distributed database, data are localized. Locally used data are stored on the corresponding site. ( ) 对 ( ) 错

A. 对
B. 错

判断题 In a replicated distributed database, each site holds an exact replica of another sits. ( ) 对 ( ) 错

A. 对
B. 错

简答题 What are the five necessary components of a DBMS?