判断题 In a fragmented distributed database, data are localized. Locally used data are stored on the corresponding site. ( ) 对 ( ) 错
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判断题 In a replicated distributed database, each site holds an exact replica of another sits. ( ) 对 ( ) 错
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简答题 What are the five necessary components of a DBMS?
简答题 What are the three database models?
简答题 What are the three-level architecture for a DBMS?