Memorex LOCK - VERSION 2-24 Informazioni Techniche Scaricare il pdf (Pagina 57)

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101

Using Job Control Language (JCL)

User Reference

Use Pursuant to Company Instructions

1-39

BIM-EPIC Job Control Language

Using Job Control Language (JCL)

Description BIM-EPIC changes the way you use job control language (JCL) and

offers many enhancements to standard VSE job controls. However,

BIM-EPIC may require some changes in order to function properly.

Physical Input/

Output Control

System

Programs that use physical input/output control systems (PIOCS) cause

conflicts with tape and disk management programs.

Physical IOCS (PIOCS) programs can cause conflicts because they often

do not follow most logical IOCS program conventions. For example,

PIOCS programs perform pre-open checking to determine the type of

device to use to process a dataset before the dataset can be opened or

before BIM-EPIC can make the assignment. Most PIOCS programs do

not update the DTF with block size, record size, record count, and address

of the last record written. Therefore, BIM-EPIC cannot find the necessary

information describing the dataset at end-of-volume/extent or close.

However, processing controlled datasets with PIOCS is not difficult. It

requires some special definitions in the JCL and, in some cases, special

settings in the BIM-EPIC dataset definition (EDD). See “

Physical IOCS

Processing” for additional information.

Cancel Status When a version record is opened, the descriptive data is entered into the

DSN Catalog and the entry is set to open status. When a version record is

closed, BIM-EPIC updates the version record and indicates that the

version has been closed and is now active/available for use as input.

If the job cancels before a version is closed, the version remains in open

status. Open versions cannot be used as input and become eligible for

scratch differently than closed versions. Open Status Generation datasets

become eligible for scratch according to the time limits set for the

TSIDUTL SCRATCH parameters THLDOPEN and DHLDOPEN. The

default is to scratch open disk datasets after two days and tape datasets

after one day. Non-generation datasets are automatically scratched the

next time an output version is created. You can also use BIM-EPIC JCL

options to delete non-generation disk datasets immediately if a job

cancels.

If a dataset successfully closes before the job cancels, the dataset becomes

an active version and is handled as if the job processed normally.

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