数据库系统概念（杨冬青）习题答案下载

weixin_39822095 2020-06-21 01:30:24

数据库系统概念（杨冬青）习题答案Chapter 1 provides a general overview of the nature and purpose of database systems. The most important concept in this chapter is that database systems allow data to be treated at a high level of abstraction. Thus, database systems differsigniﬁcantly from the ﬁle systemsand general
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数据库系统概念（杨冬青）习题答案Chapter 1 provides a general overview of the nature and purpose of database systems. The most important concept in this chapter is that database systems allow data to be treated at a high level of abstraction. Thus, database systems differsigniﬁcantly from the ﬁle systemsand general purpose programming environments with which students are already familiar. Another important aspect of the chapter is to provide motivation for the use of database systems as opposed to application programs built on top of ﬁle systems. Thus, the chapter motivates what the student will be studying in the rest of the course. The idea of abstraction in database systems deserves emphasis throughout, not just in discussion of Section 1.3. The overview of the structure of databases is, of necessity, rather brief, and is meant only to give the student a rough idea of some of the concepts. The student may not initially be able to fully appreciate the concepts described here, but should be able to do so by the end of the course. The speciﬁcs of the E-R, relational, and object-oriented models are covered in later chapters. These models can be used in Chapter 1 to reinforce the concept of abstraction, with syntactic details deferred to later in the course. If students have already had a course in operating systems, it is worthwhile to point out how the OS and DBMS are related. It is useful also to differentiate between concurrency as it is taught in operating systems courses (with an orientation towardsﬁles, processes,and physical resources)and database concurrency control (with an orientation towards granularity ﬁner than the ﬁle level, recoverable transactions, and resources accessed associatively rather than physically). If students are familiar with a particular operating system, that OS’s approach to concurrent ﬁle access may be used for illustration.

数据库系统概念（第六版）杨冬青等译实践习题答案（英文版） Database system concepts (sixth edition) Author: Abraham Silberschatz solution to practise exercise.

数据库系统概念第六版习题答案英文版

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:

数据库系统概念（第六版）杨冬青等著，课后答案全，包含实践习题和习题。完整答案。

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