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DD Statements for Tape and Disk Datasets SPACE Parameter

Chapter 6. BIM-EPIC DD Statements 6-31

specified). However, if the SPACE parameter is not specified for cataloged datasets, they are

truncated at close.

frag-control is optional. If used, it must be one of the following:

•

CONTIG specifies that each allocation must be made using consecutive tracks or blocks

for the entire allocation amount. This is the same as the DLBL option 'H'.

• MXIG and ALX both specify fragmentation without operator intervention. This is the

same as the DLBL option 'F'.

Specify only one of the CONTIG, MXIG, or ALX subparameters.

MXG and ALX have different meanings in MVS. For more information, see an MVS JCL

manual.

ROUND is optional. It specifies alignment on a cylinder boundary.

In the following example, the dataset asks for primary and secondary allocations of 5

cylinders. Unused space will be released. The dataset will be automatically cataloged.

* //DISKIN DD DSN=INVENTRY.FILE,SPACE=(CYL,(5,5),RLSE),

* // DISP=(NEW,CATLG)

In the following example, exactly the same space requirements are set, but because the DISP

parameter doesn't tell BIM-EPIC to automatically catalog the dataset, it is treated as a Start

Track 1 dataset. Note that the VOLUME parameter is also specified because it is required for

a Start Track 1 dataset.

* //DISKIN DD DSN=INVENTRY.FILE,SPACE=(CYL,(5,5),RLSE),

* // DISP=(NEW,KEEP),VOL=SER=SYSWK1

SPACE=(ABSTR,(

size-specification

))

ABSTR is required. It specifies the allocation requirements for an uncontrolled dataset. The

dataset will be allocated at the address you specify in the next parameters.

size-specification is required. It must be enclosed within parentheses and takes the

form:

primary-qty, start-address [,index]

where primary-qty specifies the size of the primary allocation in tracks or FBA blocks.

start-address specifies the starting relative track or FBA block (as in the VSE EXTENT

statement).

index is only used when both the prime and index data areas are defined using a single set of

parameters. It specifies the size of the index component for an ISAM dataset.

primary-qty, start-address, and index values are positional and must be enclosed

in parentheses.

MVS Compatibility

Controlled Dataset

Examples

Uncontrolled

Dataset Syntax

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