By Thomas M. Connolly, Carolyn E. Begg
This ebook areas a robust emphasis on stable layout perform, permitting readers to grasp layout technique in an available, step by step type. during this publication, database layout technique is explicitly divided into 3 stages: conceptual, logical, and actual. each one section is defined in a separate bankruptcy with an instance of the method operating in perform. wide therapy of the internet as an rising platform for database functions is roofed along many code samples for gaining access to databases from the net together with JDBC, SQLJ, ASP, ISP, and Oracle's PSP. an intensive replace of later chapters masking object-oriented databases, internet databases, XML, info warehousing, facts mining is integrated during this re-creation. a transparent creation to layout implementation and administration concerns, in addition to an in depth therapy of database languages and criteria, make this publication an necessary, whole reference for database professionals.
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Extra info for Database Systems: A Practical Approach to Design, Implementation and Management (4th Edition)
Xlix A set of exercises that can be used by teachers or by individuals to demonstrate and test the individual’s understanding of the chapter, the answers to which can be found in the accompanying Instructor’s Guide. net/connbegg. For further details of contents see following page. l | Companion Web site selected student resources Tutorials on selected chapters Access Lab Manual Part 1 Background Chapter 1 Introduction to Databases Chapter 2 Database Environment 3 33 Chapter 1 Introduction to Databases Chapter Objectives In this chapter you will learn: n Some common uses of database systems.
The program then reduces the number of such items in stock and displays the price on the cash register. If the reorder level falls below a specified threshold, the database system may automatically place an order to obtain more stocks of that item. If a customer telephones the supermarket, an assistant can check whether an item is in stock by running an application program that determines availability from the database. Purchases using your credit card When you purchase goods using your credit card, the assistant normally checks that you have sufficient credit left to make the purchase.
The previous chapters of this book concentrate on centralized database systems: that is, systems with a single logical database located at one site under the control of a single DBMS. Chapter 22 discusses the concepts and problems of distributed DBMSs, where users can access the database at their own site and also access data stored at remote sites. Chapter 23 examines various advanced concepts associated with distributed DBMSs. In particular, it concentrates on the protocols associated with distributed transaction management, concurrency control, deadlock management, and database recovery.