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kroenke_ch5_im - 5 Data Processing LEARNING OBJECTIVES Know...

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5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data Processing LEARNING OBJECTIVES Know the purpose of a database. Understand what a database is. List the components of a database application system. Understand how database applications make databases more useful. Understand how data models are used for database development. Know how a data model is transformed into a database design. Know how users should contribute to the development of databases. Know the responsibilities for database administration. CHAPTER OUTLINE What Is the Purpose of a Database? What Is a Database? o What Are Relationships Among Rows? o Metadata What Are the Components of a Database Application System? o What Is a Database Management System? How Do Database Applications Make Databases More Useful? o What Are Forms, Reports, and Queries? o Why Are Database Application Programs Needed? o Multi-User Processing o Enterprise DBMS Versus Personal DBMS How Are Data Models Used for Database Development? o What Is the Entity-Relationship Data Model? o Entities How Is a Data Model Transformed into a Database Design? o Normalization o Representing Relationships What Is the Users’ Role in the Development of Databases? What Are the Responsibilities for Database Administration? o DBA Development Responsibilities 5-1
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Kroenke - Using MIS 2e - Instructor’s Manual o DBA Operations Responsibilities o DBA Backup and Recovery Responsibilities o DBA Responsibilities for Adaptation o Is the DBA a Technical Person? USING YOUR KNOWLEDGE 1. Draw an entity-relationship diagram that shows the relationships among a database, database applications, and users. User Database Application Database 2. Consider the relationship between Adviser and Student in Figure 5—19. Explain what it means if the maximum cardinality of this relationship is: a. N:1 An advisor is assigned many students; a student is assigned one advisor. b. 1:1 An advisor is assigned one student; a student is assigned one advisor. c. 5:1 An advisor is assigned no more than five students; a student is assigned one advisor. d. 1:5 An advisor is assigned one student; a student is assigned no more than five advisors. 3. Identify two entities in the data entry form in Figure 5-27. What attributes are shown for each? What do you think are the identifiers? Entities: Employee; Class Employee attributes: Employee Number, First Name, Last Name, Email Class attributes: Course Name, Course Date, Instructor, Remarks Employee identifier: Employee Number Class identifier: Course Name & Course Date 4. Using your answer to question 3, draw an E-R diagram for the data entry form in 5-2
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Kroenke - Using MIS 2e - Instructor’s Manual Figure 5-27. Specify cardinalities. State your assumptions. Employees take zero or more classes; a class is taken by one or more employees Assumptions: Courses may be offered many times but always on different dates.
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