Chapter 15 Relational Implementation with DB2 David M. Kroenke Database Processing © 2000 Prentice Hall.

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Presentation transcript:

Chapter 15 Relational Implementation with DB2 David M. Kroenke Database Processing © 2000 Prentice Hall

Chapter 15 © 2000 Prentice Hall DB2 “Database2; DBMS product licensed by IBM intended primarily for large IBM mainframes” Page 411

KDK Relations Figure © 2000 Prentice Hall

Chapter 15 © 2000 Prentice Hall Key Features of DB2 Implements a relational DBMS Runs on IBM’s MVS operating system Uses SQL to perform operations Well suited to a multi-user environment Robust recovery systems Uses DB2 Data Definition Language Page 424

Chapter 15 © 2000 Prentice Hall DB2 Data Definition Language TABLE stores data VIEW virtual table TABLE SPACE a collection of one or more VSAM data sets (standard nondatabase IBM mainframe files) INDEX overhead data used to speed sorting and retrieving data Page 425

Chapter 15 © 2000 Prentice Hall DB2 Data Definition Language INDEX SPACES area of disk storage where DB2 stores an index DATA BASES a collection of DB2 tables and indexes and the storage areas that hold them STORAGE GROUPS a group of disk volumes on which DB2 allocates space for user data bases Page 425

DB2 Data Types Figure © 2000 Prentice Hall

Chapter 15 © 2000 Prentice Hall Using DB2 Create Tables, Views, and Indexes Delete Tables and Views Use DB2 SQL to Manipulate Data Use SQL Statements in the Procedure Division Page 428

Chapter 15 © 2000 Prentice Hall DB2 Concurrent Processing “implemented through shared locks (allow other applications to read the data) and exclusive locks (prevent all other applications from accessing the data)” Page 435

Chapter 15 © 2000 Prentice Hall DB2 Concurrent Processing Issues COMMIT and ROLLBACK DEADLOCK Page 437

Chapter 15 © 2000 Prentice Hall DB2 Backup and Recovery Issues Before-images After-images Backing up only pages in a table space that have been modified since the latest backup Page 437

Chapter 15 © 2000 Prentice Hall DB2 Security Issues Views Limiting Access to DB2 Resources Identifying Users Page 438

Relational Implementation Figure © 2000 Prentice Hall

Table Descriptions Figure © 2000 Prentice Hall

Interactive DB2 Statements Figure © 2000 Prentice Hall

DB2 Queries Figure © 2000 Prentice Hall

COBOL Program Figure 15-33a © 2000 Prentice Hall