Memorex LOCK - VERSION 2-24 Technical Information PDF herunterladen (Seite 341)

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101

Pre-Open Processing (TSIDASS)

User Reference

Use Pursuant to Company Instructions

8-3

When the program issues an OPEN request for the dataset, BIM-EPIC

then performs a normal device assignment to the real device.

You can also use ASSGN to make assignments to the system logical units

SYSRDR, SYSIPT, SYSLST, and SYSPCH. When you make these

assignments, you must submit these statements last. TSIDASS stops

processing control statements after one of these assignments is made.

For sort programs, use TSIDSRT to perform the assign function instead

of TSIDASS, if pre-open or assignment processing is required. However,

most SORT products do not require this. See Chapter 7, “

Sort Programs,”

for additional information and JCL examples.

When making an assignment to a system logical unit, you must supply a

dataset label for the IJSYSIN, IJSYSLS, or IJSYSPH DTF name. If a

SYSPCH or SYSLST dataset is created on tape, you must place the

dataset in closed status before you can use the dataset as input. Use

TSIDMNT CLOSE to close the dataset after it is created.

To simplify the JCL necessary to process the system files SYSIPT,

SYSLIST and SYSPCH, use the Generic Device Independence for Unit

Record (GDIUR) feature. The GDIUR feature eliminates the need for

extra TSIDASS execution, VSE CLOSE statements, and most of the

TSIDMNT CLOSE actions. GDIUR also protects your default system file

assignments in case the job terminates abnormally. See Chapter 7

“

BIM-EPIC Utilities,” for additional information on using GDIUR.

Syntax The following is an example of the assng statement syntax.

ASSGN SYSxxx

Example The following example shows how the program BILLING uses SYS021

for TAPIN1 and SYS022 for TAPOUT. TSIDASS makes the assignment

for both of these files before the BILLING program executes. The TLBL

option code 64 inhibits LUB allocation.

// JOB MAKE ASSIGNMENT WITH TSIDASS

// TLBL TAPIN1,'DAILY.TRANS',,,,,,64

// TLBL TAPOUT,'DAILY.BILLING',,,,,,64

// EXEC TSIDASS

ASSGN SYS021

ASSGN SYS022

// EXEC BILLING

OPEN

Statements

Use TSIDASS OPEN when processing controlled datasets with a

program that does not issue OPEN requests. TSIDASS OPEN issues a

logical open for the dataset so that BIM-EPIC can gain control of the

dataset.

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