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DD DISP parameter in jcl

Updated on June 19, 2012

What is the function of DD DISP parameter ?


The DISP parameter tells the disposition of the dataset. Go through the following syntax and examples with screen shots for better understanding of the concept.

Syntax:

DD DISP=(Status,normal-disposition,abnormal-disposition)

Explanation:

Status: The status field tells the current status of a dataset i.e, whether dataset is exists or has to be created. Status values can be NEW,OLD,MOD,SHR

NEW: Status of the dataset is new and is not already exists. Going to create the new dataset

OLD: Dataset is already present.

MOD: Dataset may or may not exists. If not exists creates the new dataset. If exists then it's purpose is same as OLD.

SHR: Dataset can be used by multiple jobs at same time for read purpose

Normal-disposition: What to do with the dataset upon successful run of job(normal-termination of job).

Normal-disposition values can be CATLG,DELETE,PASS,KEEP

CATLG: Save the dataset and creates the catalog entry.

DELETE: Delete the dataset

PASS: Pass the dataset to the next steps. After completion of job run delete the dataset

KEEP: Keep the dataset. But no information will be available in catlog table about the dataset.

Abnormal-disposition: What to do with the dataset upon unsuccessful run of job(abnormal-termination of job).

abnormal-disposition values can be CATLG,DELETE,KEEP


Example screen shots

The Following example screen shots shows how we use the DISP parameter in JCL

DISP=SHR

Screen shot which shows how to use DISP=SHR option in JCL
Screen shot which shows how to use DISP=SHR option in JCL

In the above example File TEST.INPUT.FILE1 is used in shared mode. Shared mode means that when the file is used by the job A in shared mode, job B, job C ..etc can also use the same file in shared mode.

DISP=(NEW,CATLG,DELETE)

Screen shot which shows how to use DISP=(NEW,CATLG,DELETE) option in JCL
Screen shot which shows how to use DISP=(NEW,CATLG,DELETE) option in JCL

DISP=(MOD,CATLG,DELETE)

Screen shot which shows how to use the DISP=(mod,catlg,delete) option in JCL
Screen shot which shows how to use the DISP=(mod,catlg,delete) option in JCL

Alternate Syntax for DISP=(MOD,CATLG,DELETE)

Screen shot which shows the alternate syntax for DISP=(mod,catlg,delete)
Screen shot which shows the alternate syntax for DISP=(mod,catlg,delete)

DISP=(OLD,CATLG,DELETE)

Screen shot which shows the how to use DISP=(old,catlg,delete) option in JCL
Screen shot which shows the how to use DISP=(old,catlg,delete) option in JCL

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