To access a VSAM file from an interactive OS/390 or MVS environment, it must be allocated to a ddname matching that of its Master File. In the OS/390 or MVS batch environment, you include the Master File ddname in your execution JCL.
In the VM/ESA environment, you issue a DLBL for the user catalog and the VSAM file.
In cases where alternate indexes are used, you must allocate or DLBL the path, or path dataset, for the alternate index cluster. The path maps the alternate index to its base cluster.
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