Datasets are mainframe files that contain the records organized in a specific format. These files are stored on the Direct Access Storage Device (DASD) or Tapes of the mainframe and are basic data storage areas. If these data are required to be manipulated in a batch program, then the physical dataset name along with the file format is coded in a JCL.
DD statement's help gives the dataset definition that is used in JCL. The required input and output resources for a job step needs to be described within a DD statement. These resources must be specified with information such as the dataset organization, storage requirements, and record length.
Syntax
The basic syntax for JCL DD is as follows.
//DD-name DD Parameters
