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IMS/DB & IMS/TM (DC) programming

Designed, written and presented by Minerva Douglas, one of the UK's foremost IMS programming specialists, this course teaches the skills and techniques required to write programmes in both IMS/DB and IMS/TM (formerly IMS/DC) environments.

The course covers not only IMS database access, but also includes the programming components necessary for coding on-line programs.

On successful completion of this course you will be able to:

  • describe the basic components of IMS DB (DL/I) and IMS/TM
  • understand and use the terminology encountered in IMS environments
  • describe and explain the main facilities available in IMS DB
  • code and test a basic COBOL or PL/I program to access IMS databases
  • write a typical Message Processing Program
  • describe the differences in conversational programs
  • write and test a simple PSB
  • use BTS to test an MPP
  • recognise simple MFS statements.

Schedule

BEDRIJFSOPLEIDING AANVRAGEN

 

Publieke opleidingskalender

Momenteel zijn er voor deze cursus geen publieke sessies gepland. Graag organiseren we een bedrijfssessie voor u of een extra publieke sessie (bij voldoende belangstelling). Geïnteresseerd? Laat het ons weten.

Intended for

This course is suitable for all programmers working in an IMS environment who need to write and maintain IMS programs. The course will also be of benefit to trainee IMS DBAs.

Background

It is assumed that the participant is familiar with writing programs in COBOL (see COBOL programming - part 1) or PL/I (see PL/I programming: fundamentals course) and has some knowledge of ISPF/PDF. Knowledge of a database management system (IMS/DB or Db2) is useful but not necessary (see courses IMS/DB programming or Db2 for z/OS fundamentals course).

Main topics

  • Introduction to IMS/DB & IMS/TM
  • Hierarchical database versus conventional files; hierarchical database terminology;
  • DB and DC comparison;
  • IMS program execution;
  • Batch Message Processing Program (BMP);
  • IMS message scheduling;
  • Logical Terminal Concept;
  • IMS message types.
  • IMS Components
  • Data Base Description;
  • Program Specification Block;
  • Application Control Block.
  • IMS/DB Programming
  • IMS batch programming;
  • DL/1 Call Statement;
  • Segment Search Arguments;
  • GU function; GN function; GNP function; ISRT function; REPL function; DLET function;
  • efficiency considerations;
  • positioning;
  • multiple qualification;
  • IMS DB status codes;
  • program structure.
  • IMS/TM Programming
  • Execution;
  • message calls;
  • IMS/DC status codes;
  • alternate destinations;
  • Program to Program messages;
  • modifiable PCBs; express PCBs;
  • conversational processing.
  • Command Codes
  • D Command Code; F Command Code; L Command Code; C Command Code; P Command Code; N Command Code; U Command Codes; V Command Code.
  • Database Access Methods
  • HSAM; HISAM; HDAM; HIDAM;
  • non-Hierarchical Sequential Organisation;
  • Secondary Indexing;
  • Logical Relationships; Logical Structures.
  • Conversational Programs
  • The scratch pad area; conversational program structure.
  • Checkpoint & 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.

Training method

Lecturing with practical exercises. The course contains several practical exercises that allow attendees to work through various programs and learn the most structured and efficient use of IMS database calls

Duration

5 days.

Course leader

RSM Technology.


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