Record File Classes

The DDM file classes that you can use to create and access record files are the direct file, keyed file, sequential file, and alternate index file classes. The DDM file classes correspond to the DDM file models explained in File Models Supported.

DDM file classes can be used to access record files as follows:

SAM data sets, VSAM ESDSs, PDSE members, and PDS members can be accessed through the sequential file class.
Note: SAM data sets and PDSE members can also be accessed through the stream file class, as explained in Stream Files and Stream Access.
VSAM RRDSs and VRRDSs can be accessed through the sequential file class or the direct file class.
VSAM KSDSs can be accessed through the keyed file class.
A VSAM alternate index and associated alternate index path can be accessed through the alternate index file class.