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Introduction to the new mainframe

Chapter 6: Using Job Control Language (JCL) and

System Display and Search Facility (SDSF)

Copyright IBM Corp., 2006. All rights reserved.


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Chapter 6 objectives

Be able to:

Explain how JCL works with the system,

techniques, and know a few of the more

important statements and keywords

reate a s mp e o an su m t t orexecution

Check the out ut of our ob throu h

SDSF

Copyright IBM Corp., 2006. All rights reserved. 2


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Key terms in this chapter

conca ena on

DD statement

Job Control Language (JCL)

recor orma

system display and search

facility (SDSF)

JOB statement

EXEC statement

step name

system catalog

procedure (PROC)

utility



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What is JCL?

Job control language (JCL) tells the system what program

to execute and provides a description of program inputs.

There are three basic JCL statements:

EXEC statement

DD statement



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JCL example

MYJOB JOB ,MSGCLASS=T

//MYSORT EXEC PGM=SORT

//SORTIN DD DISP=SHR,DSN=IBMUSER.AREA.CODES

//SORTOUT DD SYSOUT=*

//SYSOUT DD SYSOUT=*

SORT FIELDS=(1,3,CH,A)

/*



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In the preceding example

MYJOB Job name

MYSORT Step nameSORTIN DD name for program input

SORTOUT DD name for program output

SYSOUT Where to send system outputmessages (such as a data set)

pec es w et er t e nput w

be data or control statements.



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JCL: JOB statement

Create JCL statements

JOB statement

Accounting information

Execution classes



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JCL: EXEC statement

EXEC statement



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JCL: DD statement

DD statement

DD name (referenced in the program)DSN= (the data set name as cataloged on disk)



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Specifying a data set disposition:

DISP is an operand of the DD statement

DISP indicates what to do with the data set (thespos on a s ep s ar , en , or a norma en e o

fails)

data sets, which is very important for general system

o eration.



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Uses of the DISP= operand

DISP=(status,normal end,abnormal end)

DISP=(status,normal end)

DISP=status

where status can be

NEW OLD

MOD



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Creating a new data set

New data sets can be created through JCL by using the

DISP=NEW parameter.or a = reques , you nee o supp y more

information, including:

,

The type of device for the data set, UNIT=sysda

If a disk is used, the amount of space to be allocated for the

primary extent must be specified, SPACE=

If it is a partitioned data set, the size of the directory must be

Optionally, DCB parameters can be specified.



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Continuation and concatenation

Needed to overcome the limitations of the 80-column

punched cards used in earlier systems. .

Concatenation allows a single ddname to have multiple DD

statements.



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Continuation and concatenation (example)

ont nuat on examp e

//JOBCARD JOB 1,

= ,

// NOTIFY=IBMUSER

Concatenation example

//DATAIN DD DISP=OLD,DSN=MY.INPUT1// DD DISP=OLD,DSN=MY.INPUT2

= , = .



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JCL procedures - example

//MYPROC PROC

//MYSORT EXEC PGM=SORT

//SORTIN DD DISP=SHR,DSN=&SORTDSN


=

// PEND



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JCL procedures (continued)

//*---------------------------------*

//MYPROC PROC=

//SORTIN DD DISP=SHR,DSN=&SORTDSN


SYSOUT DD SYSOUT=*

// PEND//*---------------------------------*

//STEP1 EXEC MYPROC,SORTDSN=IBMUSER.AREA.CODES

//SYSIN DD *




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JCL procedures -- statement override//MYJOB JOB 1

//*---------------------------------*

//MYPROC PROC

//MYSORT EXEC PGM=SORT//SORTIN DD DISP=SHR,DSN=&SORTDSN


//SYSOUT DD SYSOUT=*

PEND

//*---------------------------------*

//STEP1 EXEC MYPROC,SORTDSN=IBMUSER.AREA.CODES

. = . . ,

// DISP=(NEW,CATLG),SPACE=(CYL,(1,1)),

// UNIT=SYSDA,VOL=SER=SHARED,

, , ,

//SYSIN DD *




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Using SDSF

ter su m tt ng a o , z users use ystem sp ay an earc

Facility (SDSF) to review the job output for successful completion

or JCL errors.

SDSF allows users to:

ew an searc e sys em og

Enter system commands

Hold, release, cancel, and purge jobs

Monitor jobs while they are processed

Display job output before deciding to print it

Control the order in which output is printed

Control printers and initiators



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SDSF panel hierarchyPrimaryOption

DisplayIn ut Out ut

Help

Panelc ve

UsersPanel

Queue

Panel

Queue

Panel

u puQueuePanel

a usPanel

r n erPanel

n a or Panel

Job

Data Set

Output

Descriptor

Output


Data SetPanel


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SDSF: Primary option menu



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SDSF: Options menu



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Viewing the JES2 output files

Screen 2



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SDSF: Display active users (DA)



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Issuing MVS and JES commands



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SDSF: Input queue panel



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SDSF: Output queue panel



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SDSF: Held output queue panel



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SDSF: Status panel



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Utilities

z nc u es a num er o programs use u n atc process ng

called utilities.

Utilities rovide man small obvious and useful functions.

A basic set of system-provided utilities is described in the

textbook (Appendix C).

ustomer s tes o ten wr te t e r own ut ty programs, many o

which are shared by the z/OS user community.

Some exam les of utilities:

o IEBGENER Copies a sequential data set

o IEBCOPY Copies a partitioned data set

w



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System Libraries

z/OS has many standard system libraries, including:

SYS1.PROCLIB JCL procedures distributed

with z/OS

SYS1.PARMLIB Control arameters for z/OS

and some program products. SYS1.LINKLIB Many of the basic execution

.

SYS1.LPALIB System execution modules

that are loaded into the linkpack area at z/OS initialization.



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Summary

as c conta ns t ree statements: , , an .

A program can access different groups of data sets in different

obs b chan in the JCL for each ob.

New data sets can be created through JCL by using the

DISP=NEW parameter.

sers norma y use proce ures or more comp ex o s.

cataloged procedure is written once and can then be used bymany users.

z/OS supplies many JCL procedures, and locally-written ones

can be added easily.

a JCL procedure to supply the parameters (usually DD

statements) needed for a specific job.



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Summary - continued

s a pane nter ace or v ew ng t e system og an t e st

of active users and controlling and monitoring jobs and

resources. Utility programs make operating on data sets easier

System libraries contain JCL procedures, control parameters,

.


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