Memorex LOCK - VERSION 2-24 Specifikace stáhnout pdf (Strana 208)

SPACE Parameter DD Statements for Tape and Disk Datasets

6-30 User Reference

SPACE Parameter

SPACE specifies the allocation of a disk dataset. Space is used to:

• specify allocation size

•

permit or inhibit truncation at close for an output dataset

• invoke dataset fragmentation if contiguous space is unavailable

• align allocation on track or cylinder boundaries on CKD devices

Parentheses are used to enclose the positional subparameters of the SPACE parameter.

Additional parentheses are used to enclose the actual allocation amounts when supplying a

prime allocation size with a secondary size and/or an index size. SPACE has two types of

syntax, one for BIM-EPIC-controlled datasets and one for uncontrolled datasets.

Using DD statements for uncontrolled disk datasets is permitted by the UNCDSK

configuration option.

SPACE=(

type

size-spec

),RLSE,

frag-control

,ROUND)

type is required. It must be one of the following:

•

TRK specifies allocation in tracks or FBA blocks.

•

CYL specifies allocation in cylinders and forces the dataset to begin and end on

cylinder boundaries.

• block-length specifies the dataset's block size for allocation by number of logical

records (ALR). block-length can also be used to specify the record size of

VSAM/SAM datasets.

size-spec is required. It must be enclosed in parentheses and takes the form:

primary-qty[,secondary-qty][,index]

where primary-qty specifies the amount of the primary allocation in tracks, FBA blocks,

cylinders, or number of logical records depending on the value specified by type. To use the

SPACE parameter to indicate an option for a cataloged dataset (such as fragmentation, no

truncation, or align on cylinder boundaries) without affecting the allocation size, specify zero

(0) in primary-qty. When primary-qty is zero, BIM-EPIC uses the allocation size in

the dataset definition.

secondary-qty specifies the size of the secondary allocation. To specify a maximum

number of secondary allocations, use the VOLUME parameter.

index specifies the size of the index component for an ISAM dataset. Use it only when both

the prime and the index areas are defined with a single set of parameters. If you use index

but omit secondary-qty, be sure to specify the comma for secondary-qty.

RLSE is optional. RLSE causes truncation of the dataset at close. The default is no truncation

if RLSE is not specified, even for cataloged datasets (when the SPACE parameter is

Description

Configuration

Options

Controlled Dataset

Syntax

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