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VSAM – Introduction to VSAM z/OS 2.5


1 hour


This course provides the learner with a basic understanding of the VSAM access method and VSAM data sets on z/OS. It introduces what VSAM is and when it is used. It includes information on the different VSAM data set types, when each is used, and their internal structure.


This course is oriented to Application Programmers, Systems Programmers and Operations staff. However, anyone needing to understand VSAM data sets will benefit from this course.


Completion of the IBM (z/OS) – The Evolving Mainframe and IBM (z/OS) – Working with the Mainframe courses


After completing this course, the student will be able to:

  • Describe the purpose of VSAM
  • Explain the structure of VSAM data sets
  • Identify the role of VSAM indexes, and how they are structured

Course Content

VSAM Basics

What is VSAM
VSAM Features
Extended Format VSAM
Types of VSAM Data sets
Control Intervals and Control Areas
Key Sequenced Data Set (KSDS)
Key and Alternate Indexes
KSDS Processing

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