All VSAM data sets, except for variable-length RRDSs, can be defined, created, and retrieved using Job Control Language (JCL). When a JCL DD statement is used to identify a VSAM data set, the DD statement must contain data set name and disposition (DISP) keywords. You can add other keywords to the DD statement when appropriate. Creating VSAM Data Sets with JCL and Retrieving an Existing VSAM Data Set describe the required JCL keywords. See z/OS MVS JCL Reference for descriptions of all the DD statements.