JCL Tutorial : JCL stand's for JOB Control Language | JCL Introduction | JCL Stages | JCL Example.

#JCL #COBOL #tutorial #Programming

JCL stand's for Job Control Language and it used on IBM Mainframe. In today's JCL tutorial, you'll learn JCL basics with step by step JCL tutorial. You'll also learn how to run the COBOL program via JCL. JCL tutorial begins with Introduction to JCL where you'll learn online processing, batch processing, JCL meaning and JCL definition itself. Let's begin the Mainframe JCL tutorial.

► Index Details ◄
0:00 Welcome to JCL Tutorial.
0:26 JCL Tutorial Agenda.
1:22 Introduction to IBM Mainframe.
2:05 Mainframe Online Processing.
2:41 Mainframe Batch Processing.
3:08 JCL Definition (JOB Control Language).
3:55 JCL Structure (JOB Statement, EXEC Statement, DD Statement).
4:36 JCL Coding rules.
6:25 JCL Execution stage.
8:41 JCL Example.
12:08 JCL tutorial end.

►JCL Introduction.
Job Control Language is the command language of the IBM Mainframe Z/OS Operating System. JCL describes a job by providing information that identifies the programs to be executed and the data to be processed. JCL tells the operating system what to do. In-fact, JCL provides a mechanism for the program to read input and write output to requested physical resources.

►JCL Structure Overview.
JCL basic structure includes three types of statements i.e. JOB statement, EXEC Statement and DD Statements. In this IBM JCL tutorial, you'll learn about various key words parameters and positional parameters which are used to code a simple JCL. A step by step JCL tutorial will help you in building a good understanding of JCL.

►JCL Execution Stages.
The life cycle of JCL is divided into the following 4 stages and JES stands for Job Entry Subsystem. It keeps track of jobs that enter the system, presents them to z/OS for processing, and sends their spooled output to the correct destination.
► Input stage: Create and submit JCL (i.e. job).
► Conversion Stage: JES2 uses a converter program to analyze each job's JCL statements and queued up a job for execution.
► Processing Stage: The initiator examines the JES spool, selects an appropriate job for execution, executes the job in its address space, and returns to the JES spool for another job.
► Output Phase: JES2 queues the output for print.

►JCL Tutorial with Example.
Cobol JCL tutorial, section will explain how you can run the COBOL program via JCL and how files name are mapped with JCL DD statements.

►JCL Example | JCL Syntax | Sample JCL.
//TPTRK23A JOB 99999,'Topictrick',MSGCLASS=A,MSGLEVEL=(1,1),
// NOTIFY=&SYSUID
//*
//* JCL TO RUN TREMP001 COBOL Pogram.
//*
//STEP01 EXEC PGM=TREMP001
//STEPLIB DD DSN=TP01.SYSLIB.LODLIB,DISP=SHR
//EMPMAST DD DSN=TP01.EMPFLE.MASTER,DISP=SHR
//EMPREPT DD DSN=TP01.EMPFLE.REPORT,DISP=SHR
//SYSPRINT DD SYSOUT=*
//SYSOUT DD SYSOUT=*
//

COBOL Program code.
IDENTIFICATION DIVISION.
PROGRAM-ID. TREMP001.
*
* PROJ DESC : COBOL PROGRAM TO GENERATE TX REPORT.
*
*
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT EMPIN ASSIGN TO EMPMAST.
SELECT EMPRP ASSIGN TO EMPREPT.
DATA DIVISION.
*
PROCEDURE DIVISION.
.....
.....
STOP RUN.

Important Point:
► IBM Mainframe z/OS doesn’t necessarily process jobs in the order in which they are submitted. Instead, JES examines the jobs in the job queue and prioritizes the work, by selecting the most important jobs to be executed first.
► Job class and priority are two characteristics that JES uses to classify a job’s importance.

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