IMS/DC Programming

Objectives
On successful completion of this course, attendees will be able to:

• write a typical Message Processing Program
• describe the differences in conversational programs
• describe the useful facilities of IMS DC
• write and test a simple PSB
• use BTS to test an MPP
• code and use simple MFS.

Who Should Attend
The course is designed for Systems Analysts, Applications Programmers and DBAs (as a first stage of their training).
Prerequisites
COBOL or PL/I programming experience as well as program edit and submission knowledge are prerequisite for attendance on this course.
Duration
3 days

Course Code
MDDC
Contents
Introduction to IMS/DC
DB and DC comparison; IMS program execution; Batch Message Processing Program (BMP); IMS message scheduling; Logical Terminal Concept; IMS message types.


IMS/DC programming
IMS commands; the I/O PCB; IMS/DC program execution; message calls; IMS/DC status codes; alternate destinations; Program to Program messages; modifiable PCBs; express PCBs; conversational processing.


Conversational programs
The scratch pad area; conversational program structure.


Checkpoint and recovery
Commit points; types of checkpoint; GSAM database; IMS DB recovery; IMS DB backout.


Batch Terminal Simulator (BTS)
BTS overview; ./T command statement; ./D command statement; ./O command statement; other BTS command statements.


Message Format Service (MFS):
MFS objectives; MFS message descriptor; MFS device format application programs & MFS; MFS control block chaining.