数据库系统概念（杨冬青）实践习题答案

Practice Exercises 1.1 This chapter has described several major advantages of a database system. What are two disadvantages? Answer: Two disadvantages associated with database systems are listed below. a. Setupofthedatabasesystemrequiresmoreknowledge,money,skills, and time. b. The complexity of the database may result in poor performance. 1.2 List five ways in which the type declaration system of a language such as Java or C++ differs from the data definition language used in a database. Answer: