Jcl dsn what is

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Current Server or Internet Access. Internet Access Required. Glossary of Terms. Comments or Feedback. For the existing dataset, the specified name used to locate the dataset. Blanks can be included in the dataset name if the name enclosed with apostrophes.

If the dataset name started with space, then the system treats it as a temporary dataset and ignores the remaining name specified. System ignores the blank characters at the end of the dataset name. System does not check the dataset names enclosed with apostrophes for valid length or valid characters. Click for Topics listing. This parameter is required for datasets that are newly created in the job step. RECFM is the record format of the dataset. FB is a fixed block organisation where one or more logical records are grouped within a single block.

V is variable organisation where one variable length logical record is placed within one physical block. VB is Variable Block organisation where one or more variable length logical records are placed within one physical block.

The larger the block, greater is the number of records for a FB or VB file. DSORG is the type of dataset organisation. But for uncataloged datasets, the DD statement should include these parameters. The UNIT parameter specifies the type of device on which the dataset is stored. The device type can be identified using Hardware Address or Device type group.

Where REF is the backward reference to the volume serial number of a dataset in any of the preceding job steps in the JCL. The DD statement parameters discussed so far corresponds to data being stored in a dataset. Following is the syntax. Following is an example, which makes use of DD statements along with various parameters explained above:.