Memorex LOCK - VERSION 2-24 Technical Information PDF herunterladen (Seite 256)

100

101

SPACE Parameter

6-40 User Reference

Use Pursuant to Company Instructions

Examples In the following example for a controlled dataset, 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, the same exact space requirements are set.

However because the DISP parameter does not tell BIM-EPIC to

automatically catalog the dataset, the dataset is treated as a Start Track 1

dataset. 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

Uncontrolled

Dataset Syntax

The following provides an example of a SPACE uncontrolled dataset

syntax:

SPACE=(ABSTR,(size-specification))

RLSE Causes unused allocated space to be truncated

when the dataset is closed. If RLSE is not

specified, truncation does not occur.

Note: For cataloged datasets, if the DD SPACE

parameter is not coded, truncation will occur.

frag-control

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 code H.

MXIG

ALX

Specify fragmentation without operator

intervention. This is the same as the DLBL option

code F.

You can specify only one of the CONTIG, MXIG,

or ALX subparameters.

MXIG and ALX have different meanings in MVS.

See an MVS JCL manual for additional

information.

ROUND Specifies allocation alignment on a cylinder

boundary.

Subparameter Definition

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