stephen linkin houston community college 19-jan-07 © 2002 - mike murach & associates, 2007 -...

19-Jan-07

© 2002 - Mike Murach & Associates, 2007 - HCC, IBM 1

Stephen LinkinHouston Community College

RESTART And Other Program RESTART And Other Program Execution Facilities Execution Facilities

© 2002 - Mike Murach & Associates, 2007 - HCC, IBM

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ObjectivesObjectives

Applied ObjectivesApplied Objectives Code RESTART On A JOB Statement To Restart A Job:Code RESTART On A JOB Statement To Restart A Job:

a.a. From The Beginning Of The First Job StepFrom The Beginning Of The First Job Step

b.b. From The Beginning Of A Named Job Step From The Beginning Of A Named Job Step Within A Job Or Cataloged ProcedureWithin A Job Or Cataloged Procedure

Assuming a Is Set To WLM Compatibility Mode, Assuming a Is Set To WLM Compatibility Mode, Code PERFORM Parameter On A Code PERFORM Parameter On A JOB Or EXEC Statement To Specify JOB Or EXEC Statement To Specify Performance Group For Job Or Job Step.Performance Group For Job Or Job Step.

Code A Command Statement To Issue Code A Command Statement To Issue An MVS Or JES Command From The An MVS Or JES Command From The JCL Stream.JCL Stream.


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ObjectivesObjectives

Knowledge ObjectivesKnowledge Objectives Explain Checkpoints And How They’re Used In A Job.Explain Checkpoints And How They’re Used In A Job. Describe How And Why Restart Processing Describe How And Why Restart Processing

Is Used.Is Used. Explain What An Automatic Restart Is.Explain What An Automatic Restart Is. Describe What A Performance Group Is.Describe What A Performance Group Is. Name The JES2 And JES3 Statements Name The JES2 And JES3 Statements

Used To:Used To:a.a. Restart A Job When The System FailsRestart A Job When The System Fails

b.b. Send A Message To The OperatorSend A Message To The Operator

c.c. Specify A Job’s System AffinitySpecify A Job’s System Affinity


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Supporting Checkpoints Supporting Checkpoints Programming Languages And UtilitiesProgramming Languages And UtilitiesLanguageLanguage UseUseCOBOL Use the RERUN clause in the I-O-CONTROL paragraph of

the Input-Output Section to generate checkpoints within a COBOL program. The ddname for the data set that stores the checkpoints is specified in the RERUN clause.

PL/I Use the CALL PLICKPT feature to generate checkpoints within a PL/I program. The ddname for the checkpoint data set is SYSCHK.

Assembler language Use the CHKPT macro instruction to generate checkpoints. The DCB macro specifies the ddname for the checkpoint data set.

JCL Use the CHKPT parameter on the DD statement to generate checkpoints whenever the end of a volume is reached for a sequential data set. The ddname for the checkpoint data set is SYSCKEOV.

DFSORT Use the CKPT parameter in sort control statements to generate checkpoints. The ddname for the checkpoint data set is SORTCKPT.


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The CHKPT Parameter Of The DD The CHKPT Parameter Of The DD StatementStatement

The SyntaxThe Syntax

Sample Job Step With EOV CheckpointsSample Job Step With EOV Checkpoints

CHKPT=EOVCHKPT=EOV

//STEP1 EXEC PGM=INVUPD//STEP1 EXEC PGM=INVUPD//INVOUT DD DSN=MM01.INV.OUT,DISP=(NEW,KEEP),//INVOUT DD DSN=MM01.INV.OUT,DISP=(NEW,KEEP),// UNIT=TAPE,VOL=SER=(TAPE01,TAPE02),// UNIT=TAPE,VOL=SER=(TAPE01,TAPE02),// // CHKPT=EOV CHKPT=EOV////SYSCKEOV DD DSN=CHECK.SAVE,DISP=MODSYSCKEOV DD DSN=CHECK.SAVE,DISP=MOD


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The RESTART Parameter Of The The RESTART Parameter Of The JOB StatementJOB Statement

The Syntax The Syntax

RESTART= ( {* } [,checkid] ) {stepname }

{stepname.procstepname}

ValueValue ExplanationExplanation** System is to restart the job at the first job step. StepnameStepname System is to restart the job at the beginning of the

named job step or at a checkpoint within that job step.

stepname.procstepnamestepname.procstepname Restart the job at the beginning of the named job step of the cataloged procedure or at a checkpoint within that job step. Stepname identifies the EXEC statement that calls the procedure and

procstepname identifies the job step within the procedure.checkidcheckid The name of the checkpoint where the system

restarts execution.


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Using The RESTART Parameter Using The RESTART Parameter

A deferred step restartA deferred step restart A deferred checkpoint restartA deferred checkpoint restart//MM01F JOB (36512),'LE MENENDEZ',RESTART=STEP3

//MM01G JOB (36512),'J TAYLOR',RESTART=STEP3.INV3020//MM01H JOB (36512),'M MURACH',RESTART=(STEP2,CKPT4)//SYSCHK DD DSNAME=MM01.CHECK,DISP=OLD


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The RD Parameter Of The JOB The RD Parameter Of The JOB And EXEC Statements And EXEC Statements


A JOB statement that uses the RD parameterA JOB statement that uses the RD parameter

An EXEC statement that uses theAn EXEC statement that uses the RD RD parameterparameter

RD= {R}RD= {R} {RNC} {RNC}

{NR} {NR} {NC} {NC}

//MM01A JOB (36512),MENENDEZ,//MM01A JOB (36512),MENENDEZ,RD=RRD=R

//STEP2 EXEC PGM=APRUPD,//STEP2 EXEC PGM=APRUPD,RD=RNCRD=RNC


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RESTART Parameter Of The JES2 RESTART Parameter Of The JES2 /*JOBPARM Statement /*JOBPARM Statement


A job that uses the JES2 RESTART parameterA job that uses the JES2 RESTART parameter

RESTART= {Y}RESTART= {Y} { {NN}}

//MM01A JOB (36512),MENENDEZ,NOTIFY=MM01//MM01A JOB (36512),MENENDEZ,NOTIFY=MM01/*JOBPARM/*JOBPARM RESTART=YRESTART=Y


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FAILURE Parameter Of The FAILURE Parameter Of The JES3 //*MAIN StatementJES3 //*MAIN Statement


Example of using the JES3 FAILURE parameter Example of using the JES3 FAILURE parameter

FAILURE= {RESTART}FAILURE= {RESTART} {CANCEL} {CANCEL}

{HOLD} {HOLD} {PRINT} {PRINT}

//MM01B JOB (36512),MENENDEZ,NOTIFY=MM01//MM01B JOB (36512),MENENDEZ,NOTIFY=MM01//*MAIN //*MAIN FAILURE=HOLDFAILURE=HOLD


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PERFORM Parameter Of The JOB PERFORM Parameter Of The JOB And EXEC Statements And EXEC Statements


A JOB Statement Using PERFORMA JOB Statement Using PERFORM

An EXEC Statement Using PERFORM An EXEC Statement Using PERFORM

PERFORM=groupPERFORM=group

//MM02D JOB (36512),'G MURACH',//MM02D JOB (36512),'G MURACH',PERFORM=10PERFORM=10

//APRCALC EXEC PGM=APRCALC,//APRCALC EXEC PGM=APRCALC,PERFORM=3PERFORM=3


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JES2 /*MESSAGE Statement JES2 /*MESSAGE Statement


/*MESSAGE statement sending message to operator/*MESSAGE statement sending message to operator

/*MESSAGE message

12345678901---------------------------------------------71

/*MESSAGE NOTIFY ON-CALL PROGRAMMER IF JOB ABENDS


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JES3 //*OPERATOR Statement JES3 //*OPERATOR Statement


//*OPERATOR sends message to operator //*OPERATOR sends message to operator

//*OPERATOR message

1234567890-13-------------------------------------------80

//*OPERATOR CALL R MENENDEZ – EXT 22 WITH RESULTS


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The JCL COMMAND Statement The JCL COMMAND Statement


COMMAND statement requesting execution of COMMAND statement requesting execution of SEND commandSEND command

//[name] COMMAND 'command command-operand'

1234567090-----x--------------------------------------------80//MSG1 COMMAND 'SEND ''PRODUCTION JOB ACCTNG1B IS NOW COMP LETE.'',USER=(MM01)' **SENDS MESSAGE TO MM01**


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End PresentationEnd Presentation

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