Memorex LOCK - VERSION 2-24 Especificaciones Pagina 185

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DD Statements for Tape and Disk Datasets Introduction to the Parameters
Chapter 6. BIM-EPIC DD Statements 6-7
DD Statements for Tape and Disk Datasets
Introduction to the Parameters
In this section, we present a brief guide to the parameters and their purposes. Following this
section, each parameter is examined in detail in a section of its own. Those sections are
arranged in alphabetical order for quick reference.
The parameters available for defining tape and disk datasets are:
* //
ddname
DD DSN=
dataset-name
[ ,AMP=x ]
[ ,DCB=x ]
[ ,DISP=x ]
[ ,FREE ]
[ ,LABEL=x ]
[ ,OPTION=x ]
[ ,SPACE=x ]
[ ,UNIT=x ]
[ ,VOL=x ]
The AMP parameter is used to define a VSAM cluster or a VSAM/SAM dataset.
The DCB parameter defines the dataset's record characteristics. DCB is an MVS term that
stands for dataset control block. It determines the block size, logical record length, density
(for tape), and dataset organization (for example, sequential, direct access, or indexed
sequential for disk datasets).
Use the DISP parameter for almost all datasets. It specifies the current status of the dataset
and its disposition at normal or abnormal termination.
The DISP parameter specifies whether a dataset is new or already exists, whether it should be
retained at close or deleted, whether it should be cataloged or left uncontrolled, and so on.
Because the DISP parameter says so much about the dataset being processed, it also serves as
documentation for your JCL, and it is sometimes used explicitly for that purpose even when
only the defaults are specified.
DSN defines the name of the dataset to be processed. It is required for all tape and disk
datasets. It also defines which version or versions of the dataset are processed. If you do not
specify a particular version, all versions are read in on input (automatic concatenation).
AMP
DCB
DISP
DSN
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