Memorex LOCK - VERSION 2-24 Informations techniques télécharger pdf (Page 285)

100

101

Multi-Dataset Processing

User Reference

Use Pursuant to Company Instructions

7-17

 Tape size (SIZ)

 Vaulting method (VLT)

 Tape pool (TPL)

Several important limitations apply when creating a subdataset EDD.

These limitations are:

 You must catalog the subdatasets using Online Manager or

TSIDMNT, or autocatalog them using DD statements. You

cannot use TLBL statements to autocatalog subdatasets.

 You must enter the prime dataset name correctly when a

subdataset is defined to the catalog. The prime dataset name

cannot be changed later. You can supply independent retention

criteria, passwords, and block sizes for each subdataset.

 You may find it helpful to give all the datasets in each

multi-dataset group a single, unique user ID or system ID. This

makes it easier to report or scratch the datasets as a group, rather

than as individual datasets.

JCL

Requirements

There are several JCL requirements you must consider.

 You must inhibit LUB allocation for all datasets using either

option 64 in a TLBL statement or option SYSnnn in a DD

statement.

 You must inhibit LUB allocation through the DSN Catalog, if

you are creating subdatasets with a single program that opens

multiple DTFs with different logical units. To force BIM-EPIC to

use the same logical unit for each dataset, specify the same SYS

number in each EDD.

 You can use a VSE // ASSGN statement to assign the SYS

number from the previous step to the SYS number in the current

step, if you are creating subdatasets with different programs using

DTFs with different logical units. This may be necessary when

using different utility programs to create subdatasets when the

utilities require different SYS numbers to be used.

 BIM-EPIC corrects the file sequence number on your TLBL if it

is incorrect. You may omit the file sequence number.

 You must specify TLBL option 16 (dataset drop), if your

program uses multiple open requests for the same DTF name.

Dataset drop is automatic when you use multiple DD statements

with the same ddname.

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