JCL BASIC PARAMETERS

CLASS= Identifies the JES job class this job will execute under. Job classes are setup at the JES initialization. CLASS places the job into a JES input queue

CLASS is one character, A-Z or  0-9.

MSGCLASS= Assigns the job Log to an output class. One Character long A-Z or  0-9.

A : Print on standard form

B: Punch

MSGLEVEL= It controls which statement will be printed on the job log.

0: Prints only the JOB statement

1: Prints all JCL and JES statements

2: Prints only submitted JCL and JES statements.

Positional parameters

*

DATA

DUMMY

DYNAM

Keyword Parameters

DSN

DISP

UNIT

SPACE

DCB

VOLUME

EXEC  Statement Defines the begining of the step in the job or procedure. There Can be max 255 EXEC Statements in a job.

SPACE PARAMETER: Used to Allocate Space for datasets.

Syntax  ->  SPACE=(CYL,(primary,secondary,directory),RLSE,CONTIG,MXIG,ROUND)
                 Instead of CYL, We can use TRK or BLK

TRK: Requesting space in track
CYL: Requesting space in cylinders
PRIMARY:Primary storage to be allocated at the time of data set created
SECONDARY: Additional storage to be allocated, If primary storage is not sufficient

DIRECTORY:Space for recording of name and location of partitioned data sets

RLSE:Request for release of space previously allocated unused space after completion of job

CONTIG : Request for contiguous space

MXIG:  Request for large aread of contiguous space

ROUND: Request for entire cylinder for storage of data set

UNIT: Identifies the Device or the type of device on which the dataset will be allocated.

Example:

UNIT=SYSDA  /* Allocates the data on DASD*/

UNIT=3390      /*Allocates data set on 33390 type disk*/

UNIT=TAPE    /* Allocate on tape*/

DCB  PARAMETER(DATA CONTROL BLOCK):
Specifies the characteristics of the dataset
LRECL   :  Record Length
RECFM  :  Record Format
BLKSIZE:  Block Length