Memorex LOCK - VERSION 2-24 Información técnica descargar pdf (Pagina 226)

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Parameters for Tape and Disk Datasets

6-10 User Reference

Use Pursuant to Company Instructions

DD Parameters

Parameters for Tape and Disk Datasets

Description This section provides descriptions for the tape dataset parameters and the

disk dataset parameters as well as the purpose of each parameter.

Syntax The following provides an example of the syntax showing the parameters

available for use with tape datasets and disk datasets.

* //ddname DD DSN=dataset-name

[ ,AMP=x ]

[ ,DCB=x ]

[ ,DISP=x ]

[ ,FREE ]

[ ,LABEL=x ]

[ ,OPTION=x ]

[ ,SPACE=x ]

[ ,UNIT=x ]

[ ,VOL=x ]

Parameters The following provides a brief description of each parameter. Detailed

information describing each parameter can be found later in this chapter.

Parameter Description

AMP Use the AMP parameter to define a VSAM cluster or a

VSAM/SAM dataset.

DCB Use the DCB parameter to define the dataset record

characteristics. DCB is an MVS term that stands for

dataset control block and is roughly analogous to the VSE

DTF macro set. DCB determines the block size, logical

record length, tape density, and dataset organization, for

example, sequential, direct access, or indexed sequential

for disk datasets.

DISP Use the DISP parameter to specify the current status of

the dataset and its disposition at normal or abnormal

termination. For example, whether a dataset is new or

existing, whether it should be retained at close or deleted,

whether it should be cataloged or left uncontrolled.

Because the DISP parameter specifies so much about a

dataset, it can serve as documentation for your JCL and is

sometimes used solely for that purpose when only default

values are specified.

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