Chapter 2. DB2 Environment
DB2 operates as a formal subsystem of z/OS. DB2 utilities run in the batch environment, and applications that access DB2 resources can run in the batch, TSO (Time Sharing Option), USS (UNIX System Services), IMS (Information Management System), or CICS (Customer Information Control System) environment. IBM provides attachment facilities to connect DB2 to each of these environments.
This chapter looks at the subsystem architecture that supports DB2 and the attachments available. This chapter also looks briefly at the installation process of the DB2 subsystem and the subsystem parameters known as DSNZPARMs, as well as how to execute the utilities and various commands.
DB2 also has the ability to access other DB2 subsystems and other relational databases. This chapter takes a look at the methods for doing this.