Jcl Slides Day1

Introduction

JOB CONTROL LANGUAGE

AGENDA FOR DAY 1

JCL Introduction

JOB Statement

JOB Parameters ( Positional and Keyword )

What is JCL ?.

Question

What is JCL ?.

JCL stands for JOB CONTROL LANGUAGE

Provides a Mechanism to communicate the requirements to execute a program, to the MVS operating system.

JCL consists of statements that provide specifications to execute a JOB

JOB CONTROL LANGUAGE (JCL)

JCL is a language which allows users to communicate with the operating system

JCL step tells the operating system

– Name, location of the application program to be processed

– Name and location of the data files needed by the application program

– Hardware devices needed by the application program

to achieve its function

Why we need JCL ?.

Question

Why we Need JCL ?.

Job control language will identify all the resources needed by the program to the MVS Operating system.

You need to have JCL , If you want to run your program in batch mode in a mainframe environment.

Control serious of JOB executed in Mainframe Environment

How JCL Works ?.

Question

HOW JCL WORKS ?.

Every JCL coded has to be run; In Mainframe terminology, it is

called submitting the JCL; henceforth known as submitting the JOB

There is a subsystem in MVS called JES (short for Job Entry

Subsystem) that manages JOBS submitted to the system by users

JES

Receives JOBS

Schedules JOBS based on their priority

Allocates resources to JOBS as they execute

Processes output generated by JOBS

JES RESP

Structure of JCL

Overview

JOB CONTROL LANGUAGE

JOB STMNT

EXEC STMT

DD STATEMENT

STRUCTURE OF JCL

oVERVIEW

General Format of JCL Statement

JCL Statements are coded as 80 bytes records and are categorized into following fields:

IDENTIFIER Field

NAME Field

OPERATION Field

PARAMETER Field

COMMENT Field

Basic Format for JCL Statement

//P390B21R JOB 3612,’RAJESH’,NOTIFY=P390B21//POST EXEC PGM=CM3000//CUSTRAN DD DSN=P390B21.CUSTOMER.TRANS,DSP=SHR//CUSTRAN DD DSN=P390B21.CUSTOMER.TRANS,DSP=SHR//ERRLST DD SYSOUT=*

Identifier

Name Field

Operation Field

Parameter Field

Question and Answers

Overview

JOB STATEMENT

Overview

What is JOB STATEMENT ?.

Question

CODING RULES FOR JOB STATEMENT

Overview

Coding Rules for of Job Statement

Example: Coding Rules for of Job Statement

Coding Rules for of Job Statement for Operation Field

Coding Rules for of Job Statement

JCL Field Definition Rules

PARAMETER fields follow OPERATION field and separated by commas

COMMENT field

Follows parameter field and can contain any details

Must be preceded by one blank

Can be entered in all lines

Coding Rule for Parameter Field

Coding Rules for Parameter Field

Parameter Fields

Parameter fields are of two types – Positional and Keyword Parameters

Positional Parameters

Should be coded in a specific sequence

Separated by commas

Omitted parameters indicated by a comma to indicate the positional nature

Keyword Parameters

No specific sequence and can be coded in any order

Format is parm=<value>

Separated by commas

Follow positional parameters

Can be omitted altogether if required

Position and Keyword Parameters

Coding Rules for Positional Parameter

Coding Rules for Keyword Parameter(1)

Coding Rules for Comment field

Coding Rules for Comment Field

JOB statement identifies the JOB to the system

JOB Statement consists of

JOBNAME

JOB operator

Positional Parameters

Accounting Info

Programmer NAME

Keyword Parameters

MSGCLASS

CLASS

MSGLEVEL

NOTIFY

REGION

TIME

PRTY

COND

RESTART

TYPRUN

JOB STATEMENT

JOB NAME

Starts in column 3

following the identifier

field

Should be between 1 to

8 characters

First character should be

Alphabetic and not a

Number

Should be followed by a

space

JOB Operator

Preceded and succeeded by a blank space

Positional Parameters

JOB statement consists of two positional parameters

Job Accounting Information

Programmer name

Accounting Information

Identifies the Account number to the system to track the CPU time used by the JOB

Has two positional sub parameters – Account number and Additional Accounting info

Format is (<account-number>, <additional-accounting-info>)

Format is installation dependent

Within accounting info, If only <account-number> is

specified, then parantheses can be omitted

If only <additional-accounting-info> is specified, then the absence of <account-number> is specified by a comma to indicate the positional nature of the sub parameters

JCL

MVS

JES

CPU

ACCOUNT

ACCT#, CPU Time

BILL

Account 1

Account 2

Accounting Information - Examples

KEYWORD PARAMETERS

Overview

Keyword Parameters

Keyword parameters follow positional parameters and can be in any order

Some of the keyword parameters used in the JOB statement are

CLASS

NOTIFY

PRTY

REGION

TIME

TYPRUN

MSGCLASS

MSGLEVEL

COND

RESTART

CLASS PARAMETER

Is an optional keyword parameter

Specifies the type of JOB submitted to the system

Some JOBS are CPU intensive, while others are more Input-Output oriented; JOB characteristics like these are identified to the system by the CLASS parameter

Format is CLASS=<class> where <class> is a character between A to Z or 0 to 9

Installations will have a default class assigned to the CLASS parameter

Programmers to check with system administrator about list of classes defined in the system

CLASS A

CLASS B

CLASS Q

OS

JESCPU1

CPU 2

CPU 3

J1

J2

J3

SPOOL

J1 & J2 Processed

CLASS A & B

J3 Processed

CLASS Q

CLASS Parameter in JOB Statement

NOTIFY PARAMETER

Specifies the user to whom JOB is to be submitted after completion

Can specify the user ID or the parameter (&SYSUID)

PRTY PARAMETER

PRTY

Specifies priority for scheduling JOBS within a CLASS

Permitted value ranges from 0 to 14 or 0 to 15 depending on JES2

PRTY PARAMETER

MSGCLASS PARAMETER

Is an optional keyword parameter

Specifies the specific output device to which the messages are to be routed after completion of the JOB

Format is MSGCLASS=<classname> where <classname> is a character between A to Z or 0 to 9

Assigns JOB log to a particular sysout CLASS

Installations will have a default class assigned to the MSGCLASS parameter

Programmers to check with system administrator about list of message classes defined in the system

MSGLEVEL PARAMETER

Is an optional Keyword parameter

Controls the level of listing of the JCL output of the JOB

Formats available are

MSGLEVEL=(<statements>, <messages>)

MSGLEVEL=statements

MSGLEVEL=(, <messages>)

Permitted values for statements are

0 for listing only JOB statement

1 for listing all JCL statements including procedures

2 for listing only input statements

Permitted values for messages are

0 for not listing any allocation messages

1 for listing all allocation messages

Preferred option is MSGLEVEL=(1,1)

MSGLEVEL=(0,0)

MSGLEVEL=(0,0)

JESJCL: Shows only JOB

statement details

JESYSMSG: Shows no

allocation message

details; Shows only

Start and Stop times

JESJCL: Shows only JOB

statement details

JESYSMSG: Shows all allocation messages

MSGLEVEL=(0,1)

JESJCL: Shows all JCL

statements

JESYSMSG: Shows no

allocation message

details; Shows only

Start and Stop times

MSGLEVEL=(1,0)

MSGLEVEL=(1,1)

JESJCL: Shows all JCL statements

JESYSMSG: Shows all allocation message

MSGLEVEL=(2,0)

JESJCL: Shows all JCL statements without substitutions

JESYSMSG: Shows no allocation message details; Shows only Start and Stop times

MSGLEVEL=(2,1)

JESJCL: Shows all JCL statements without substitutions

JESYSMSG: Shows all allocation message

COND Parameter

Overview

COND PARAMETER

Specifies whether the JOB should continue or terminate depending on the outcome of any step in the JOB

Before each step is executed, the system checks the COND parameter against the return code from completed JOB step

If satisfied, the system terminates the JOB, else it executes the JOB

Format is COND=((code, operator), (code, operator)…)

Interpretation of Condition Codes

COND parameter check Return code from completed step

Terminate JOB Execute JOB

COND=(code,GT) RC < code RC > = code

COND=(code,GE) RC <= code RC > code

COND=(code,EQ) RC = code RC not = code

COND=(code,LT) RC > code RC < = code

COND=(code,LE) RC >= code RC < code

COND=(code,NE) RC not = code RC = code

In this visual, condition code set at JOB level is COND=(4,LT) which interprets that if the Return Code from any step is greater than 4, bypass the remaining steps in the JOB

Program

RTCODE04 if executed returns a RC of 4

RTCODE08 if executed returns a RC of 8

RTCODE16 if executed returns a RC of 16

In the executed JOB STEP3 is bypassed as the Return Code from STEP2 is 8 which is greater than 4

COND PARAMETER

Visual shows part of the

JOBLOG of JOB executed

with COND=(4,LT)

JOBLOB shows the JOB

terminated with STEP2

COND PARAMETER

In the visual, condition code set at JOB level is COND=(8,GE) which interprets that if the RC from any step is less than or equal to 8, bypass the remaining steps in the JOB

Program RTCODE16 in STEP1 if

executed, returns a RC of 16

RTCODE00 in STEP2 if executed, returns a RC of 0

RTCODE04 if executed returns a RC of 4

Result is STEP3 is bypassed as the RC from STEP2 is 0 which is less than 8

COND PARAMETER

Visual shows part of the

JOBLOG of JOB executed

with COND=(8,GE)

JOBLOG shows the JOB

terminated with STEP2

COND PARAMETER

REGION PARAMETER

Specifies the amount the workspace required by the operating system to execute the JOB

Value specified will apply to each step

Formats are:

REGION=<value>K

REGION=<value>M

REGION parameter should only be in units of “K” or “M” indicating Kilobytes or Megabytes of workspace requested; Results in JCL error if unit is not specified

If omitted, a default value is assigned by the system

If REGION=0M is specified, the system takes the most optimum space

Region

Region

Region

ADDRSPC PARAMETER

ADDRSPC Parameter

ADDRSPC SDSF Output

ADDRSPC SDSF Output

PAGES Parameter

TIME PARAMETER

Specifies the maximum CPU execution time permitted for the JOB

If actual CPU execution time exceeds value specified in the TIME parameter, JOB will fail with S322 abend

Formats are

TIME=(minutes, seconds)

TIME=minutes

TIME=(,seconds)

TIME=1440

TIME=NOLIMIT

Seconds can be in the range from 0 to fifty nine

TIME Parameter

TYPRUN PARAMETER

TYPRUN is used for special JOB processing

Formats are

TYPRUN=HOLD

TYPRUN=SCAN

TYPRUN=HOLD causes the JOB to be held in the input queue till released by an operator

TYPRUN=SCAN causes the JCL to be scanned for syntax errors and reports the errors. The JOB is not executed when this option is used

RESTART PARAMETER

Is an optional keyword parameter

Instructs the JOB to restart execution from a specific step, instead of from beginning of the JOB

Formats are

RESTART=<stepname>

RESTART=<stepname.procstepname>

END