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Creating and Setting Up Users › How to Increase ACID Size › Define a VSAM Cluster in the Catalog

Define a VSAM Cluster in the Catalog

The VSAM data set increases the number of records that can be stored by converting the records to VSAM. Before creating the VSAM file, you must define the VSAM cluster that the file that will occupy.

Follow these steps:

  1. Edit the sample JCL in VSAMDEF3 to specify the data set name and volume to be allocated.

    Important! Do not run STEP 2 if the security file is not shared.

  2. Run VSAMDEF3.

    The VSAM base cluster file is defined in the catalog. If the security file is shared, the alternate index file and path file are defined.