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Using Concatenating Datasets

7-66 User Reference

Use Pursuant to Company Instructions

Using Concatenating Datasets

Description Dataset concatenation reads multiple versions of a dataset or multiple

datasets with one open. This allows you to process a number of datasets

as if they were a single dataset.

All versions of concatenated datasets must reside on the same device

type. If the datasets have different block sizes, you must read the dataset

with the largest block size first.

DSN Catalog No special entries are required.

JCL

Requirements

When using a TLBL statement or a DLBL statement, there are several

JCL requirements you must consider.

 Use a separate TLBL statement or DLBL statement for each

dataset to be read. Datasets are processed in the order in which

their label statements display.

 Use the same DTF name for each statement and supply the

concatenation option code for all except the last version, for

example, TLBL option code 48 and DLBL option code E.

WARNING:

Do not specify the concatenation code on the last label statement

in a concatenation group.

Examples The following example processes versions 1 through 5 of the

DAILY.TRANS dataset on disk with one open. The example also

processes WEEKLY.TRANS and WEEKLY.RERUN on tape with

another single open. Although there are mixed device types in the job,

they are not mixed within a single open, so the device types meet the

requirements for concatenation.

// DLBL INPUT1,'DAILY.TRANS,(E,V=5)'

// DLBL INPUT1,'DAILY.TRANS,(E,V=4)'

// DLBL INPUT1,'DAILY.TRANS,(E,V=3)'

// DLBL INPUT1,'DAILY.TRANS,(E,V=2)'

// DLBL INPUT1,'DAILY.TRANS'

// TLBL INPUT2,'WEEKLY.TRANS',,,,,,48

// TLBL INPUT2,'WEEKLY.RERUN'

// EXEC PROGRAM

When using DD statements, concatenation is automatic for all versions of

a single dataset on input. You must specify DSN=data.set.name without

specifying a particular version. When all versions of a single dataset are

concatenated, datasets are read in order from the most current version to

the oldest version.

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