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Module 3: Access Method Services (AMS)

Access Method Services (AMS)

  • Now since you know important concepts of VSAM, Let’s get into how practically that can be implemented using AMS
  • Access Method Services – AMS is a powerful service program. It is be used to perform various functions on VSAM and non-VSAM datasets
  • IDCAMS is the most popular utility provided for AMS
  • There are two types of Access Method Services commands:-
    • Functional commands:- Used to request actual work. For example, Defining, Altering, Deleting a dataset or listing a catalog information
    • Modal commands:- Used to specify conditions for execution of functional commands. For example, “IF-THEN-ELSE”. TSO users can use only functional commands


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