1. Next Back MAP 3-1 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved Chapter 3 Database Management Systems

2. Next Back MAP 3-2 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Database management system (DBMS) helps you specify the logical organization (referred to earlier as logical structure ) for a database and access and use (use implies manipulating) the information within a database. Return to Main Presentation

3. Next Back MAP 3-3 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved A DBMS contains the following five important software components:  DBMS engine  Data definition subsystem  Data manipulation subsystem  Application generation subsystem  Data administration subsystem Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Return to Main Presentation

4. Next Back MAP 3-4 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved Figure 3.4 Software Subsystems of a Database Management System page 85 Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Return to Main Presentation

5. Next Back MAP 3-5 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved DBMS engine 1.Accepts logical requests from the various other DBMS subsystems, 2.converts them into their physical equivalent, and 3.actually accesses the database and data dictionary as they exist on a storage device such as a hard drive. DBMS engine  Data definition subsystem  Data manipulation subsystem  Application generation subsystem  Data administration subsystem Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Return to Main Presentation

6. Next Back MAP 3-6 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved Data definition subsystem helps you create and maintain the data dictionary and define the structure of the files in a database. In other words, the data definition subsystems allows you to create and maintain the tables (relations), relationships and constraints. DBMS engine  Data definition subsystem  Data manipulation subsystem  Application generation subsystem  Data administration subsystem Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Return to Main Presentation

7. Next Back MAP 3-7 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved Data manipulation subsystem helps you add, change, and delete information in a database and mine it for valuable information. Tools here include  views,  report generators,  QBE, and  SQL. DBMS engine  Data definition subsystem  Data manipulation subsystem  Application generation subsystem  Data administration subsystem Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Return to Main Presentation

8. Next Back MAP 3-8 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved Application generation subsystem contains facilities to help you develop transaction- intensive applications. Application generation subsystems usually include:  Tools for creating visually appealing data entry screens  Tools for creating easy to use data entry screens  DBMS-specific programming languages  Commonly used programming languages DBMS engine  Data definition subsystem  Data manipulation subsystem  Application generation subsystem  Data administration subsystem Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Return to Main Presentation

9. Next Back MAP 3-9 Management Information Systems for the Information Age Copyright 2002 The McGraw-Hill Companies, Inc. All rights reserved Data administration subsystem A DBMS helps you manage the overall database environment by providing facilities for  backup and recovery,  security management,  query optimization,  concurrency control, and  change management. On Your Own DBMS Support OLTP, OLAP, Information (p. 92) Management (p. 92) DBMS engine  Data definition subsystem  Data manipulation subsystem  Application generation subsystem  Data administration subsystem Manipulate Data = Information The Database Management Systems (DBMS) The DBMS Return to Main Presentation