MySQL 数据库系统设计实现与管理第六版课后习题答案Part 1 Review Questions and Exercises.doc

Database Systems: Instructor’s Guide - Part III PAGE PAGE 18 Word可编辑 SOLUTIONS TO REVIEW QUESTIONS AND EXERCISES FOR PART 1 – BACKGROUND (CHAPTERS 1 – 3) Solutions to Review Questions and Exercises TOC \o "1-3" \h \z \u Chapter 1 Introduction to Databases 3 Chapter 2 Database Environment 7 Chapter 3 Database Architectures and the Web 11 Chapter 1 Introduction to Databases Review Questions 1.1 List four examples of database systems other than those listed in Section 1.1. Some examples could be: A system that maintains component part details for a car manufacturer; An advertising company keeping details of all clients and adverts placed with them; A training company keeping course information and participants’ details; An organization maintaining all sales order information. 1.2 Discuss each of the following terms: Data For end users, this constitutes all the different values connected with the various objects/entities that are of concern to them. See also Section 1.3.4. Database See Section 1.3.1 Database Management System See Section 1.3.2 Database Application Program See Section 1.3.3 Data Independence Security The protection of the database from unauthorized users, which may involve passwords and access restrictions. See also Section 1.6. Integrity The maintenance of the validity and consistency of the database by use of particular constraints that are applied to the data. See also Section 1.6. Views These present only a subset of the database that is of particular interest to a user. Views can be customized, for example, field names may change, and they also provide a level of security preventing users from seeing certain data. See also Section 1.3.3. 1.3 Describe the approach taken to the handling of data in the early file-based systems. Discuss the disadvantages of this approach. Focus was on applications for which programs would be written, and all the data required would be stored in a file or files owned by the programs. S