Description

Students will gain an understanding of the hierarchical concepts of IMS; the IMS database structures and their impact on programs; the process of defining database structures; database access and update methods; methods of validating database access and updates; and, commonly used command codes.

Objectives

At the completion of this course, the student will be able to:

Understand the basic IMS components (DBD and PSB)
Be able to code batch IMS programs the read, insert, update and delete IMS databases
Code all required programs such as calls, entry, SSAs (qualified and unqualified) and PCBs in the linkage section
Understand how to work within a hierarchical structure
Understand and utilize command codes including path calls

Topics

Database Definition
Program Specification Block
CALL Statement and its Parameters
Linkage Section of a COBOL Program
RETRIEVE Functions (GU, GN, GNP)
UPDATE Functions (ISRT, REPL, DLET)

Audience:

Programmers responsible for writing application programs which will access IMS databases.

Course Overview

I. Introduction to IMS Concepts
- A. File structures
- B. Hierarchial concepts
  - 1. SEGMENT
  - 2. FIELD
  - 3. Sequence field
  - 4. Search key
  - 5. Parent
  - 6. Child
  - 7. Root segment
  - 8. Database record
  - 9. Twins
  - 10. Maximums
II. Basic Database Definition
- A. The purpose
- B. Components
- C. DBD statement
- D. DATASET statement
- E. SEGM statement
- F. FIELD statement
- G. Other optional statements
  - 1. LCHILD statement
  - 2. XDFLD statement
- H. Other required statements
  - 1. DBDGEN statement
  - 2. FINISH statement
  - 3. END statement
III. Program Specific Block
- A. The purpose
- B. Application views
- C. Control statements
- D. PCB statement
- E. SENSEG statement
- F. SENFLD statement
- G. PSBGEN statement
IV. Program Components
- A. IMS and the program
- B. IMS interface
- C. Program setup overview
- D. Program communication blocks
- E. ENTRY statement
- F. CALL statement
V. Get Calls
- A. GU
- B. GN
- C. GNP
VI. Update Calls
- A. Insert
- B. Replace
- C. Delete
VII. JCL Considerations
- A. Compilation JCL
- B. Execution JCL
VIII. IMS Workshop
- A. IMS workshop
  - 1. Client
  - 2. Consultant
  - 3. Problem
  - 4. Solution
- B. Procedures
- C. Database description
- D. Useful Copy Book members

IMS Basic Programming Techniques Virtual Classroom Live January 17, 2018

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