jcl-lc-slides01-fp2005-ver1.0
TRANSCRIPT
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JCL
Day 1
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Course Plan
Day 1 : Introduction to JCL, JOB & EXEC statement , JES commands
Day 2 : DD statements, JCL Procedures & IBM Utilities
Day 3 : Introduction to VSAM, GDG & SMS
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Pre-requisites
• MVS Operating system and its subsystem TSO
• Navigating through ISPF
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Topics beyond the scope
• VSAM file-handling
• User coded COBOL program execution
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Evaluation Mechanism
Component Marks Schedule
Test 100 After Day 3
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References
Title Author Publisher
OS/390 and z/OS JCL
Raul Menendez Murach
MVS JCL Doug Lowe Mike Murach & Associates, Inc
MVS/VSAM Gary D Brown & S.A.M. Smith
SPD
IBM Online manuals
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Agenda for Day 1 Introduction to JCL
What is JCL Why we need JCL How we can use it
Sequence & priority of execution
Job statement Syntax Parameters
Exec statement Syntax Parameters COND parameter
JES commands, JCL errors & Abends
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J C L
JOB CONTROL LANGUAGE
What does JCL stand for ?
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What is JCL then?
• Not a Procedural or OO Language
• JOB CONTROL LANGUAGE
• Interface between Programs & MVS OS.
• Why JCL?
• Sample JCL code
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Sample JCL
//UseridJ JOB ,,NOTIFY=&SYSUID,CLASS=D,
// MSGLEVEL=(1,1),MSGCLASS=X
//* SAMPLE JCL
//STEP1 EXEC PGM=SEQPROC
//STEPLIB DD DSN=OPERN.CICS3.LOADLIB,DISP=SHR
//SYSPRINT DD SYSOUT=*
//INFILE DD DSN=YourMainframeId.JCL.DAY2.FILE1,DISP=SHR
//OUTFILE DD DSN=YourMainframeId.JCL.DAY2.FILE2,
// DISP=(NEW,CATLG,DELETE),
// UNIT=SYSDA,SPACE=(TRK,(10,5),RLSE),
// DCB=(LRECL=80,BLKSIZE=8000,RECFM=FB)
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Various stages of JCL execution
Determinethejob
CreatetheJCL
Submitthe
JOB
JESinterpretsJCL andpasses it
toMVS
MVS doesthe work
UserViews andInterprets
output
JEScollects
the outputand information
aboutthe JOB
SystemMessages
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Various stages of JCL execution
• Input
• Conversion
• Execution
• Output
• Hard copy
• Purge
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INPUT
INPUT
SPOOL
JCLSYSIN
JES
MVS
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CONVERSION
SPOOL
JCLSYSIN
MVS
JES
PROCLIB
PROC
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CONVERSION
JOB INTERPRETER - JES2
JES2ADDRESS
SPACE
INITIATORADDRESS
SPACE
PAYJCL
INTERPRETER
PAYCONTROLBLOCKS
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CONVERSION
JOB INTERPRETER - JES3
JES3ADDRESS
SPACE
INITIATORADDRESS
SPACE
PAYJCL
INTERPRETER
PAYCONTROLBLOCKS
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EXECUTION, OUTPUT, HARDCOPY and PURGE
• Execution:– JES selects a job for execution , based upon job CLASS and
job selection PRTY
Ex: //ER5077 JOB ,,PRTY=8,CLASS=A
– Allocation of datasets– SYSIN and SYSOUT
• OUTPUT, HARDCOPY and PURGE
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JCL PROCESSING
JCL
SYSIN
SYSOUT
SPOOLJES2 /JES3
JES2 /JES3
INITIATOR1INITIATOR2
PRINTER
INPUTSTREAM
INITIATOR3
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JCL execution
JCL INITIATION
STEP INITIATION
ALLOCATION
PROGRAM EXECUTION
STEP TERMINATION
JOB TERMINATION
JCL
SYSIN
SYSOUT
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QUESTIONS ???
• JCL is used to write an application program ? Yes/No
•What are the different stages of JCL processing ?
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JCL statements
• JOB - Job Identification
• EXEC - Instruction for Execution
• DD - Source of data to operate
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JOB STATEMENT
ACCT CLASS
NAME NOTIFY
MSGLEVEL
TYPRUN MSGCLASS
PRTY COND
RESTART USER
REGION PASSWORD
PERFORM TIME
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IMPORTANT JOB PARAMETERS Positional Parameters
a) Account Informationb) Name
EX: //ER5077J JOB A123,NAME1
All these parameters are optional as far as JCL is concerned, they are probably required by your installation.
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IMPORTANT JOB PARAMETERS Keyword Parameters
EX: //ER5077J JOB ,,CLASS=A
• CLASS specifies the job class that is the nature of the job. Installation will specify which of the 36 possible classes to use which is from A to Z and 0 to 9 .
• Installation establishes a default class that is in effect if CLASS is omitted.
CLASS
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A typical JOB Class assignment
Class Characteristics
A Execute within 15 min of submission
B Execute within 30 min of submission
C Execute within 60 min of submission
D Execute Overnight
H Will be held until released by operator
L Execute within 15 min of submission
T Requires Tape Processing
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IMPORTANT JOB PARAMETERS Keyword Parameters
EX: //ER5077J JOB ,,MSGCLASS=A
• MSGCLASS specifies the job scheduler message output class.
• Job scheduler messages include all messages not printed by the job steps being executed but the JCL messages and system messages
• Installation establishes a default class that is in effect if MSGCLASS is omitted.
MSGCLASS
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IMPORTANT JOB PARAMETERS Keyword Parameters
EX: //ER5077J JOB ,,MSGLEVEL=(1,1)
• MSGLEVEL(statements,messages) specifies the printing of JCL statements and allocation messages.
• EX: MSGLEVEL(0,1) will print only JOB statement, and all the allocation, JES, SMS and operator messages
• By default it is MSGLEVEL(1,1)
MSGLEVEL
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IMPORTANT JOB PARAMETERS Keyword Parameters
//ER5077J JOB ,,NOTIFY=&SYSUID//ER5077J JOB ,,NOTIFY=ER5077
• Requests the system sends a message to the TSO user id specified when the job completes processing
NOTIFY
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IMPORTANT JOB PARAMETERS Keyword Parameters
EX: //ER5077J JOB ,,TYPRUN=SCAN
• TYPRUN checks the JCL and holds the job in the input queue.
• TYPRUN = SCAN checks the JCL for syntax errors and suppresses execution of the job
• TYPRUN = HOLD holds the JCL in the input queue for later execution.It is held until the operator releases it.
• TYPRUN = JCLHOLD(JES2 only) similar to HOLD but the difference is it is checked while it is not with the HOLD option.
• TYPRUN = COPY(JES2 only) lists or duplicates the lines placed in the JOB statement to the class assigned in the MSGCLASS parameter and suppresses execution.
TYPRUN
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SOME OTHER Keyword JOB PARAMETERS
PRTY=Priority : is related to the CLASS parameter. It assigns priority to jobs which belong to the same class.priority numbers range from (0-14) or (0-15) depending on installations.
TIME=(min,sec) : signifies how much CPU time the JOB can take to run.
RESTART=STEPNAME :Forces the JOB execution to start from a particular STEP.
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SOME OTHER keyword JOB PARAMETERS
• REGION=96K :To override the default amount of workspace assigned for the job.
• COND=(4,LT) :Permits the execution of a steps to depend on the return code from the previous steps.
• ADDRSPC=REAL : It is used to specify whether the program is to use REAL or VIRTual ADDRess SPaCe. Default is Virtual. If Real is coded then the REGION parameter is also to be coded.
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EXEC STATEMENTS
PGM COND
PROC PARM
ACCT REGION
ADDRSPC TIME
PERFORM
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IMPORTANT EXEC PARAMETERS positional parameters
EX: //STEP1 EXEC PGM=IEFBR14
The PGM parameter identifies the name of the program that is to be executed.
EX: //STEP1 EXEC PROC=MYPROC
The PROC parameter identifies the name of the procedure that is to be called.
PGM & PROC
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IMPORTANT EXEC PARAMETERS keyword parameters
EX: //STEP1 EXEC PGM=IEBUPDT,PARM=‘LET,MAP,XREF’
The PARM parameter is used to supply information to a program as it executes.
PARM
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IMPORTANT EXEC PARAMETERS keyword parameters
EX: //STEP1 EXEC PGM=IEBUPDT,ADDRSPC=VIRT
The ADDRSPC parameter is to indicate to the system that the job step is to use either VIRT (virtual) or REAL (real) storage.
By default it is virtual.
ADDRSPC
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IMPORTANT EXEC PARAMETERS keyword parameters
EX: //STEP3 EXEC PGM=IEBUPDT,COND=(8,LE,STEP1)
• The COND Permits the execution of steps to depend on the return code from the previous steps.
• The question should be is 8 less than the RC code of STEP1. If Yes then Bypass STEP3 If No Execute STEP3
• The COND parameter is also a JOB parameter.
COND
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COND parameter in detail
Format :
COND=( 0/4/6/8/12/16 , GT/GE/LT/LE/EQ/NE , step name , EVEN/ONLY )
RC comparison code (0 - 4095)
Condition
EVEN : step will be executed even if previous steps terminate abnormally
ONLY : step will be executed only if previous stepsterminate abnormally.
Only code in the exec statementnot in job statement
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COND parameter examples (in JOB statement)
//ER5077J JOB ,,COND=(4,LT)//STEP1 EXEC PGM=IEFBR14 //STEP2 EXEC PGM=IFBR14 //STEP3 EXEC PGM=IEFBR14
• STEP1 executes with RC = 0
• STEP2 executes with RC *S806 that is it is greater than 4
• Job terminates
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COND parameter examples (in EXEC statement)
//ER5077J JOB ,,CLASS=A//STEP1 EXEC PGM=IEFBR14 //STEP2 EXEC PGM=IEFBR14,COND=(0,EQ,STEP1)
• STEP1 executes with RC = 0
• STEP2 does not execute
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COND parameter examples (in EXEC statement)
// ER5077J JOB ,,CLASS=A//STEP1 EXEC PGM=IEFBR14 //STEP2 EXEC PGM=IEFBR14,COND=ONLY
• STEP1 executes with RC = 0
• STEP2 does not execute
//ER5077J JOB ,,CLASS=A//STEP1 EXEC PGM=IFBR14 //STEP2 EXEC PGM=IEFBR14 //STEP3 EXEC PGM=IEFBR14,COND=ONLY
• STEP1 abends with RC = *S806• STEP2 does not execute ( if a single step abends all other steps are bypassed if no COND statement is there )• STEP3 executes with RC = 0
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COND parameter examples (in EXEC statement)
//ER5077J JOB ,,CLASS=A//STEP1 EXEC PGM=IEFBR14 //STEP2 EXEC PGM=IEFBR14,COND=EVEN
• STEP1 executes with RC = 0
• STEP2 executes with RC = 0
//ER5077J JOB ,,CLASS=A//STEP1 EXEC PGM=IFBR14 //STEP2 EXEC PGM=IEFBR14 //STEP3 EXEC PGM=IEFBR14,COND=EVEN
• STEP1 abends with RC = *S806
• STEP2 does not execute ( if a single step abends all other steps are bypassed if no COND statement is there )
• STEP3 executes with RC = 0
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IMPORTANTEXECPARAMETERS keyword parameters (IF/THEN/ELSE/ENDIF)
EX: // IF STEPA.RC GE 4 THEN //jcl statements // ELSE //jcl statements // ENDIF
• The IF/THEN/ELSE/ENDIF statement construct provides a simple means of selectively executing job steps.
• It is available in Release 4 or later , of MVS/ESA and eliminates the need to struggle with the COND parameter.
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IF/THEN/ELSE/ENDIF parameter examples
//ER5077A JOB 2933100P,ABC,MSGCLASS=A,CLASS=A//STEP1 EXEC PGM=IEFBR14 // IF STEP1.RC GT 0 THEN //STEP3 EXEC PGM=IEFBR14 //DD1 DD DSN=ER5077.TRUE.PS,DISP=(NEW,CATLG), // VOL=SER=INUSR2, // SPACE=(TRK,(1,1)), // DCB=(LRECL=80,BLKSIZE=800,RECFM=FB) // ELSE //STEP4 EXEC PGM=IEFBR14 //DD2 DD DSN=ER5077.FALSE.PS,DISP=(NEW,CATLG), // VOL=SER=INUSR2, // SPACE=(TRK,(1,1)), // DCB=(LRECL=80,BLKSIZE=800,RECFM=FB) // ENDIF /*
STEPNAME PROCSTEP RC STEP1 00 STEP3 FLUSH STEP4 00
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COMMON keyword PARAMETERS in JOB & EXEC
TIME
REGION
PERFORM
COND
ADDRSPC
ACCT
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ER/CORP/CRS/OS02/003Version No: 1.0
JOB ENTRY SUBSYSTEM
JES2 / JES3
JES2 or JES3 statements can be
included to communicate with JES concerning...• INPUT• OUTPUT• PROCESSING
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ER/CORP/CRS/OS02/003Version No: 1.0
JES2 Control Statements
$COMMAND OUTPUT SIGNOFF
JOBPARAM PRIORITY SIGNON
MESSAGE ROUTE XEQ
NETACCT SETUP XMIT
NOTIFY
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ER/CORP/CRS/OS02/003Version No: 1.0
JES2 Control Statements
NOTIFY - direct job’s notification messages to a user.
PRIORITY or PRTY -Assign a selection priority for your job. Within a job class, a job with a higher priority is selected for execution sooner.
• JES2 Control statements are preceded with /* in col1 & col2.
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Errors
•JCL syntax errors. JOB will not be submitted
• JCL allocation errors. JES2-subsequent steps will not get executed.
JES3-detects errors in the beginning.
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ER/CORP/CRS/OS02/003Version No: 1.0
Abend Failures
An ABEND failure occurs under the following conditions:
A program while executing, attempts to perform an instruction or operation which the system recognizes as being impossible or unacceptable.
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Causes of Abend Failures
Logic error Resource unavailability Exceeding limits (Time or Space on DASD) Hardware Malfunction User ABENDS Operator intervention Operating System failure
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Thank You!