Defining IAM Data Sets under TSO

TSO Defines

IAM data set can be defined under TSO, using a variety of methods. TSO offers an IDCAMS Define process through the DEFINE CLUSTER command. TSO also has a method similar to the JCL define, by using the TSO ALLOC command. IAM provides a set of ISPF panels, and the underlying software, which includes the capability to define an IAM dataset through an easy to use fill in the blanks method. Many other products offering various capabilities under ISPF for VSAM files will also work with IAM files.

The one major difference under TSO is that all of the above methods utilize the standard TSO dataset naming conventions. If the dataset name is not specified within apostrophes, then the dataset name will be prefixed. This prefix is normally your TSO user id, but can be changed.