jcl nivel intermedio unidad 6

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z/OS MVS JCL Intermediate

Copyright IBM Corp., 2000, 2004. All rights reserved.


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Copyright IBM Corp., 2000, 2004. All rights reserved. Page 2 of 80

UNIT Symbolic Parameters

DDNAME and Symbolic Parameters

The DDNAME Parameter

Symbolic Parameters

EXEC Statement Parameter

Assigning Different Values

DD Statement Parameters

Default Values

Topics:


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At the end of this unit, you will be able to:

Understand the purpose and form of the DDNAMEparameter in a procedure definition

Resolve the DDNAME parameter when executing a

procedure by identifying the actual data set names andattributes represented by the DDNAME parameter

Understand the purpose and form of symbolicparameters in a procedure definition

Assign values to symbolic parameters at the time of

invoking a procedure

Unit Objectives

Unit: Symbolic Parameters

Introduction


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Symbolic Parameters




Default Values

Topics:


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At the end of this topic, you will be able to:

Identify the parameter variations in procedures

Identify the techniques used to modify the parameters

Topic Objectives

Unit: Symbolic Parameters Topic: DDNAME and Symbolic Parameters

Introduction


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Variations in procedure statements can be quite

common between different instances of a

procedures use.

For example, in a procedure like TRANSACT,

one or more items vary from one instance of the

procedure's use to the next, such as:

Name, location, or other attributes ofone or more data sets identified in theprocedure

Names of one or more programs to be

executed

Parameter Variation in Procedure

Continued


Concepts


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These variations can be accommodated by

temporarily modifying the procedure at the

time the procedure is executed.

This is accomplished by adding or overriding

parameters on the procedure EXEC and DD

statements.

These modifications are subject to strict

formatting and sequencing rules.

Parameter Variation in Procedure (contd)

INTRAN

NEWTRAN

TRANSACT


Concepts


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If variations in procedure are common, override

and addition statements can be avoided.

Alternatives to using override and addition

statements are:

Use the DDNAME parameter on one ormore DD statements in the proceduredefinition

Use symbolic parameters to representEXEC or DD statement parameters inthe procedure definition

Techniques to Change Parameters


Concepts


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A _______________ parameter is an actual data set and its attributes.

Are We on Track?


Review


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Now that you have completed this topic, you should be able to:

Identify the parameter variations in procedures

Identify the techniques used to modify the parameters

Topic Summary


Summary


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Symbolic Parameters




Default Values

Topics:


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Discuss the need for the DDNAME parameter in aprocedure

Identify the form of a DDNAME parameter in a procedure

Resolve a DDNAME parameter

Identify the components in a DDNAME parameter

Topic Objectives

Unit: Symbolic Parameters Topic: The DDNAME Parameter

Introduction


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The DDNAME parameter is used in a procedure

definition to represent an input data set.

It permits the procedure user to define data set

attributes at the time the procedure is invoked.

The example on the right shows that at varioustimes the input data for a procedure could reside

on a direct access volume or a tape.

Input Data Streams

TRANSACT

(TAPE)

(DIRECT

ACCESS

VOLUMES)


Concepts


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Representing an Input Data Stream

The DDNAME parameter consists of:

A parameter name (DDNAME) followed by an equal sign

A value (in this example: INPUT)

For example:

//DD1 DD DDNAME=INPUT


Concepts


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The TRANSACT procedure definition with a

DDNAME parameter to represent the input data

set is shown on the right.

Representing an Input Data Stream An Example

//PSTEP1 EXEC PGM=PROG1,


//DD2 DD DSN=MASTER,DISP=SHR

//DD3 DD SYSOUT=A

//DD4 DD DSN=&&VALID,

// DISP=(NEW,PASS),

// UNIT=SYSDA,// SPACE=(TRK,(1,1))



// DISP=(OLD,DELETE)


Concepts


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At the time of execution to invoke the procedure,

you would code:

An EXEC statement that executes theprocedure

A DD statement to identify the attributesof the data set represented byDDNAME=INPUT

This is called resolving the DDNAME parameter.

For example, the DDNAME is resolved with a

data set named INTRAN as shown in the code:

//STEP EXEC TRANSACT

//PSTEP1.INPUT DD DSN=INTRAN,

// DISP=SHR

Resolving the DDNAME parameter

Continued

TRANSACT

INTRAN


Concepts


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The DD statement that resolves the DDNAMEparameter has two components:

The name of the procedure step inwhich the DD statement containing theDDNAME parameter is used, followedby a period

The value as specified in the DDNAMEparameter

Resolving the DDNAME parameter (contd)


//PSTEP1.INPUT DD DSN=INTRAN,

// DISP=SHR

Procedurestep

Defines

the dataset

Value

Specifies that thedata set is used

shared access mode


Concepts


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The following is a procedure called MYPROC. The procedure uses the DDNAME parameter torepresent the data set in PSTEP1.

Code a statement to invoke the procedure.

//JSTEP EXEC _______________

Are We on Track?

//PSTEP1 EXEC PGM=PGM1



Review


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The following is a procedure called MYPROC. The procedure uses the DDNAME parameter torepresent the data set in PSTEP1.

Code a statement to resolve the DDNAME parameter with a data set named MYDATA.

//JSTEP EXEC MYPROC

___________________

Are We on Track?

//PSTEP1 EXEC PGM=PGM1



Review


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To execute the TRANSACT procedure, the userexecutes the procedure using a data set named

MYDATA in shared access mode.

MYDATA resides on a 3390 direct access

volume with a volume identifier of 45678Z.

In this case, the DDNAME parameter is resolved

with the data set name of MYDATA.


//PSTEP1.INPUT DD DSN=MYDATA,

// UNIT=3390,// VOL=SER=45678Z

Resolving the DDNAME parameter Example 1

TRANSACT

MYDATA


Concepts


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The DDNAME parameter in the same procedureis resolved for using different input data.

The user invokes the TRANSACT procedure and

directs that input data be taken from card images

supplied in the job stream.

Resolving the DDNAME parameter Example 2


//PSTEP1.INPUT DD *

(input data records)

.

.

./*


Concepts


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If an input data set is not needed for the execution of the procedure then the DD statement to identify the dataset should not be coded.

The unresolved DDNAME is automatically treated as a dummy.

Avoiding an Input Data Set


Concepts


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The DDNAME parameter can be used in a procedure definition in as many as five DD statements within eachprocedure step.

The sequencing rules to be followed when resolving DDNAME parameters are:

They must be coded in procedure step sequence

DD statements to resolve DDNAME parameters are considered additions and should be sequencedas such (that is, in procedure step sequence)

If multiple DDNAME parameters are specified in a single step of the procedure definition, the DDstatements to resolve them can be coded in any sequence

Rules for Resolving DDNAME Parameters


Concepts


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The following is a procedure called ANYPROC:

Code the statements required to resolve the procedures WEEKNO DDNAME parameters to

specify WEEKNO as an existing data set named WEEK2.

//JSTEP EXEC ANYPROC

//_________________________

Are We on Track?

//PSTEP1 EXEC PGM=CBL5

//IN DD DDNAME=WEEKNO//OUT DD DSN=&&TEMP,

// DISP=(NEW,PASS),UNIT=SYSDA,

// SPACE=(TRK,(1,1))//PSTEP2 EXEC PGM=CBL6

//PSD DD DSN=&&TEMP,DISP=(OLD,DELETE)

//RPT DD DDNAME=OUTPUT


Review


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The following is a procedure called ANYPROC:

Code the statements required to resolve the procedures OUTPUT DDNAME parameters to specify

OUTPUT to be a data set named SAVE.

//JSTEP EXEC ANYPROC

//PSTEP1.WEEKNO DD DSN=WEEK2

//_________________________

Are We on Track?

//PSTEP1 EXEC PGM=CBL5

//IN DD DDNAME=WEEKNO//OUT DD DSN=&&TEMP,

// DISP=(NEW,PASS),UNIT=SYSDA,

// SPACE=(TRK,(1,1))//PSTEP2 EXEC PGM=CBL6

//PSD DD DSN=&&TEMP,DISP=(OLD,DELETE)

//RPT DD DDNAME=OUTPUT


Review


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DUMMY A parameter coded in the DD statement that instructs the system toignore all other parameters, with the exception of DCB.

Glossary

Glossary



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Discuss the need for the DDNAME parameter in aprocedure

Identify the form of a DDNAME parameter in a procedure

Resolve a DDNAME parameter

Identify the components in a DDNAME parameter

Topic Summary


Summary


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Symbolic Parameters




Default Values

Topics:


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Discuss the need of symbolic parameters

Identify the syntax of symbolic parameters

Topic Objectives

Unit: Symbolic Parameters Topic: Symbolic Parameters

Introduction


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Symbolic Parameters

A symbolic parameter is used in a procedure definition to represent a procedure statement parameter orsubparameter. It can also be used to build flexibility into the procedure.

Symbolic parameters are coded when procedure statement parameters whose values are most likely to

change from one procedure invocation to another.

Symbolic parameters are often assigned default values. When the procedure is invoked the default values canbe accepted or appropriate values can be assigned to them on the EXEC statement.


Concepts


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Symbolic parameters:

Are preceded by an ampersand (&)

Consist of up to seven alphanumeric (Ato Z, 0 to 9) or national (#,@,$)characters, beginning with an alphabeticor national character

Can represent EXEC statement or DDstatement parameters

Form of Symbolic Parameters

Symbolic parameters are preceded by asingle ampersand, whereas temporary dataset names are preceded by two ampersands.

Examples of Symbolic

Parameters

ACCT=&DEPT

PGM=&PROG1

//STEP1 EXEC PGM=PROG1,ACCT=&DEPT

//DD1 DD DSN=&WEEK


Concepts


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Which of the following statements apply to the use of symbolic parameters?

A. They can be specified for a DD or EXEC statement parameter

B. They represent a procedure statement parameter or subparameter

C. They are identified in a procedure by a preceding # sign

D. They are coded in a procedure definition

Are We on Track?


Review

/OS MVS JCL I di


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From the following items, select the symbolic parameters.

A. ACCT=&GRP

B. SYSOUT=A

C. DSN=&&SYN

D. VOL=SER=&SERNO

Are We on Track?


Review

/OS MVS JCL I t di t


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Discuss the need of symbolic parameters

Identify the syntax of symbolic parameters

Topic Summary


Summary



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Symbolic Parameters

EXEC Statement Parameters



Default Values

Topics:



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Recognize symbolic parameters

Assign values to or nullify EXEC statement parameters

Topic Objectives

Unit: Symbolic Parameters Topic: EXEC Statement Parameters

Introduction



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An example of a symbolic parameter to representan EXEC statement parameter is shown on the

right.

Here the TRANSACT procedure is defined with a

symbolic ACCT parameter (&DEPT) for PROG1

(in PSTEP1) and PROG2 (in PSTEP2).

ACCT=&DEPT

Recognizing Symbolic Parameter An Example


//PSTEP1 EXEC PGM=PROG1,ACCT=&DEPT

//DD1 DD DSN=INTRAN,DISP=SHR


//DD3 DD SYSOUT=A


// DISP=(NEW,PASS),





//DD6 DD SYSOUT=A

Concepts



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Assigning Values to EXEC Statement Parameters

When executing TRANSACT, a value would be assigned to the symbolic parameter on the EXEC statementthat invokes TRANSACT.

When assigning a value to the symbolic parameter the ampersand in front of the symbolic parameter is

omitted.

The following statement assigns the value GRP50 to the &DEPT symbolic parameter:

//JSTEP EXEC TRANSACT,

// DEPT=GRP50


Concepts



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The rules for assigning values to or nullifying EXEC statement parameters are:

Separate the value assignments or nullifications from operands and from each other using commas.

Specify the symbolic parameter without the preceding ampersand, followed by an equal sign andthe value.

To nullify a symbolic parameter specify the symbolic parameter without the preceding ampersand,followed by an equal sign. No value is specified for the symbolic parameter while nullifying it.

Symbolic parameters can be nullified or assigned values in any sequence.

Rules for Assigning Values to or Nullifying EXEC Statement Parameters


Concepts



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The effect of not coding a value for a symbolic parameter is to _____________ the symbolicparameter.

Are We on Track?


Review



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The following is the TRANSACT procedure definition:

Code an EXEC statements to execute the procedure and assign a value of GRP25 to the &DEPTsymbolic parameter.

//JSTEP EXEC _______________________

Are We on Track?


//DD1 DD DSN=INTRAN,DISP=SHR//DD2 DD DSN=MASTER,DISP=SHR

//DD3 DD SYSOUT=A

//DD4 DD DSN=&&VALID,DISP=(NEW,PASS),// UNIT=SYSDA,

// SPACE=(TRK,(1,1))


//DD5 DD DSN=&&VALID,DISP=(OLD,DELETE)

//DD6 DD SYSOUT=A


Review



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Now that you have completed this topic, you will be able to:

Recognize symbolic parameters

Assign values to or nullify EXEC statement parameters

Topic Summary


Summary


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Analyze the conditions for assigning different values tosymbolic parameters

Modify a PGM parameter

Topic Objectives

Unit: Symbolic Parameters Topic: Assigning Different Values

Introduction



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Different values cannot be assigned to the samesymbolic parameter when invoking the procedure.

For example, it is not possible to assign GRP50 to

&DEPT in PSTEP1 and GRP100 to &DEPT in

PSTEP2 unless one of the following conditions

exists:

A different symbolic parameterrepresents each occurrence of theparameter

An EXEC or DD statement override or

addition statement is used wheninvoking the procedure

Conditions




//DD2 DD DSN=MASATER,DISP=SHR

//DD3 DD SYSOUT=A


// DISP=(NEW,PASS),





//DD6 DD SYSOUT=A

Concepts



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To illustrate the first condition, assume theTRANSACT procedure has been created to allow

for two different values for the EXEC statement

ACCT parameters, as follows:

//PSTEP1 EXEC PGM=PROG1,ACCT=&DEPT1

...//PSTEP2 EXEC PGM=PROG2,ACCT=&DEPT2

In the example on the right, the TRANSACT

procedure has been invoked with the values

GRP50 and GRP100 for PSTEP1 and PSTEP2

respectively.

Assigning Different Values Example 1

Values can be assigned to thesymbolic parameters in any order.


//JSTEP EXEC TRANSACT,DEPT1=GRP50,

// DEPT2=GRP100

Concepts



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Here the procedure has been created withoutsymbolic parameters:

//PSTEP1 EXEC PGM=PROG1

...

//PSTEP2 EXEC PGM=PROG2

At the time of invoking the procedure, an

addition statement as shown on the right can be

coded to assign an ACCT value of GRP50 for

PSTEP1 and GRP100 for PSTEP2.

Assigning Different Values Example 2


//JSTEP EXEC TRANSACT,

// ACCT.PSTEP1=GRP50,

// ACCT.PSTEP2=GRP100

Concepts



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As a procedure user, when can you assign different values to the same symbolic parameter?

A. When a symbolic parameter represents the parameter

B. When a different symbolic parameter represents each occurrence of the parameter

C. When you code an addition or an override statement when invoking a procedure

D. Never

Are We on Track?


Review



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Assigning Values to the PGM Parameter

The PGM parameter is the only EXEC statement parameter that cannot be modified with an overridestatement when a procedure is executed.

If a symbolic parameter is specified in the procedure definition, an appropriate value can be assigned when

invoking the procedure.


Concepts



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In this example, different versions of the programs executed by the TRANSACT procedure are being tested tosee which versions best suit departmental requirements.

Symbolic parameters are assigned to the PGM parameter in the TRANSACT procedure EXEC statement, so

the procedure user can specify which program versions are to be executed.

The PGM Parameter An Example


Concepts



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The TRANSACT procedure definition withsymbolic PGM parameters for the PSTEP1 and

PSTEP2 EXEC statements is shown on the right.

The statements used to invoke the procedure and

execute programs TEST1 and TEST2 would be:

//JSTEP EXEC TRANSACT,PROG1=TEST1,

// PROG2=TEST2

The statements used to invoke the procedure and

execute programs TEST3 and TEST4 would be:

//JSTEP EXEC TRANSACT,PROG1=TEST3,

// PROG2=TEST4

Symbolic PGM Parameters


//PSTEP1 EXEC PGM=&PROG1



//DD3 DD SYSOUT=A


// DISP=(NEW,PASS),





//DD6 DD SYSOUT=A

Concepts



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The following is the TRANSACT procedure definition:

Code an EXEC statement to execute

a.) TEST4 for PSTEP1 andb.)TEST5 for PSTEP2.

//JSTEP EXEC _______________________

Are We on Track?



//DD2 DD DSN=MASTER,DISP=SHR//DD3 DD SYSOUT=A

//DD4 DD DSN=&&VALID,DISP=(NEW,PASS),// UNIT=SYSDA,


//PSTEP2 EXEC PGM=&PROG2//DD5 DD DSN=&&VALID,DISP=(OLD,DELETE)

//DD6 DD SYSOUT=A


Review



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PGM An EXEC statement parameter that names the program to be executed.

Glossary

Glossary




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Analyze the conditions for assigning different values tosymbolic parameters

Modify a PGM parameter

Topic Summary


Summary



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Symbolic Parameters




Default Values

Topics:



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Discuss how to change a DD statement parameter

Understand the rules for assigning a DD statementparameter value

Topic Objectives

Unit: Symbolic Parameters Topic: DD Statement Parameters

Introduction



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Symbolic parameters are often specified for DDstatement parameters, if the values for those

parameters are likely to change.

Changing DD Statement Parameters


WEEK1

WEEK2

DSN=&WEEK

Concepts

TRANSACT



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For example, suppose the identification of thedata set containing customer transactions for

TRANSACT varies from week to week.

DD Statement Parameters An Example


WEEK1

WEEK2

TRANSACT

Concepts

DSN=&WEEK



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The TRANSACT procedure definition with asymbolic DSN parameter value for the DD1 DD

statement is shown on the right.

DD Statement Parameters An Example



//DD1 DD DSN=&WEEK,DISP=SHR


//DD3 DD SYSOUT=A


// DISP=(NEW,PASS),





//DD6 DD SYSOUT=A

Continued

Concepts



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DD Statement ParametersAn Example (contd)

The following EXEC statement is used to invoke the procedure using WEEK1 as the input data set:

//JSTEP EXEC TRANSACT,WEEK=WEEK1

By simply assigning the appropriate data set name to &WEEK when the procedure is invoked, the

data sets to be used for the other weeks can be specified.


Concepts



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If the same symbolic parameter is used torepresent an parameter (such as the UNIT

parameter) in several DD statements, then the

value needs to be assigned to the symbolic

parameter only once.

The value is applied to all occurrences of the

parameter. The need to code several override

DD statements can be eliminated.

Assigning Values


EXE

WEEK1

WEEK2

DSN=&WEEK

Concepts



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The rules for assigning values to or nullifying DD statement parameters are:

Separate the value assignments or nullifications from parameters and from each other usingcomas.

Specify the symbolic parameter without the preceding ampersand, followed by an equal sign andvalue.

To nullify a symbolic parameter specify the symbolic parameter without the preceding ampersand,followed by an equal sign. The value for the symbolic parameter should not be coded.

Symbolic parameters can be nullified or assigned values in any sequence.

Rules for Assigning Values to DD Statement Parameters


Concepts



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Copyright IBM Corp., 2000, 2004. All rights reserved. Page 64 of 80Review

The following JCL statements are from a procedure named ANYPROC.

//S1 EXEC PGM=PROG1,ACCT=&GRP

//DD1 DD DSN=&INPUT,DISP=SHR

//...

//S2 EXEC PGM=&A,ACCT=&GRP

Which of the following statements are correct to invoke the procedure and specify the followingnullify the &GRP symbol, assign a value of MYDATA to &INPUT, assign a value of TSTPRG to &A.

A. //JSTEP EXEC ANYPROG,GRP=,INPUT=MYDATA

B. //JJSTEP EXEC ANYPROC,INPUT=MYDATA,A=TSTPRG,GRP=

C. //JSTEP EXEC ANYPROC,A=TSTPRG,GRP=,INPUT=MYDATA

D. //JSTEP EXEC ANYPROC,A=TSTPRG,INPUT=MYDATA

Are We on Track?


Review



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Assigning Values to DD Statement Parameters

While assigning values to symbolic parameters:

An appropriate value that represents a data set name must be assigned to the symbolic parameter

If the symbolic parameter is not assigned a value, the system considers the symbolic parameter tobe the name of a temporary data set because it begins with the ampersand character


Concepts



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If no value is assigned to a symbolic parameter in a procedure DD statement at the time ofinvoking a procedure, it is treated as a ___________________ data set.

Are We on Track?


Review



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Copyright IBM Corp., 2000, 2004. All rights reserved. Page 67 of 80Introduction


Discuss how to change a DD statement parameter

Understand the rules for assigning a DD statementparameter value

Topic Summary


Summary



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Symbolic Parameters




Default Values

Topics:



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Understand how to assign default values to parameters

Accept default values for parameters

Nullify default values for parameters

Topic Objectives

Unit: Symbolic Parameters Topic: Default Values

Introduction



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At the time symbolic parameters are created, creator of the procedure can also assign default values to theparameters.

What are the characteristics of default values?

The characteristics of default values are:

They are specified in the parameter field of the PROC statement

They do not have a preceding ampersand

In the case of multiple symbolic parameters, they are separated by a comma

They can be assigned in any sequence

Recognizing Default Values


Concepts



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In the TRANSACT procedure definition shown onthe right, the PROC statement assigns the default

value G300 to &DEPT and the default value

PROG2 to &PROG.

Default Values An Example

//TRANSACT PROC DEPT=G300,PROG=PROG2


// ACCT=&DEPT



//DD3 DD SYSOUT=A

//DD4 DD DSN=&&VALID,// DISP=(NEW,PASS),

// UNIT=SYSDA,


//PSTEP2 EXEC PGM=PROG,ACCT=&DEPT



//DD6 DD SYSOUT=A


Concepts



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Which of the following statements are true for default values?

A. They are assigned on the PROC statement of a procedure.

B. They are preceded by an ampersand.

C. They must be assigned in a specific sequence.

D. They can be overridden when the procedure is executed.

Are We on Track?


Review



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The EXEC statement required to accept thedefault values and specify the data set named

WEEK1 is shown on the right.

Accepting Default Values

//JSTEP EXEC TRANSACT,WEEK=WEEK1


Concepts



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Code an EXEC statements to invoke the TRANSACT procedure and accept default values.

// EXEC _______________________

Are We on Track?


Review



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Nullifying Default Values

When should you assign a value?

A value for a symbolic parameter should be assigned (or nullified) only if:

The default values specified in the PROC statement is not appropriate for that particular execution ofthe procedure

No default value is specified for the symbolic parameter on the PROC statement in the procedure

Continued


Concepts



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The rules for overriding or nullifying the default values are:

To override a default value, specify the symbolic parameter without the preceding ampersand,followed by an equal sign and the appropriate value

To nullify a default value, specify the symbolic parameter without the preceding ampersand,followed by only an equal sign

The overrides and nullifications for default values can be specified in any sequence

Nullifying Default Values (contd)


Concepts



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In this example, the TRANSACT procedure is to beinvoked with some input test data (DD1 DD

statement) that resides in a data set named

TSTDATA and a test program named TESTPRG

for step PSTEP2.

Because this execution is a test, a department

number need not be specified.

Thus, the default values G300 (specified for

&DEPT) and PROG2 (specified for &PROG) are

not needed.

Nullifying Default Values Procedure Definition

//TRANSACT PROC DEPT=G300,PROG=PROG2


// ACCT=&DEPT


//DD2 DD DSN=MASATER,DISP=SHR

//DD3 DD SYSOUT=A

//DD4 DD DSN=&&VALID,// DISP=(NEW,PASS),

// UNIT=SYSDA,


//PSTEP2 EXEC PGM=PROG,ACCT=&DEPT



//DD6 DD SYSOUT=A


Concepts



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The EXEC statement for the invocation is shownon the right. The EXEC statement does the

following:

Nullifies the default values specified for&DEPT

Overrides the default value specified for&PROG and assigns the valueTESTPRG instead

Assigns the value TSTDATA to &WEEK

Nullifying Default Values EXEC Statement

The nullification, override and assignment ofnew values can be coded in any order on theEXEC statement used to invoke the procedure.

//JSTEP EXEC TRANSACT,DEPT=,

// PROG=TESTPRG,

// WEEK=TSTDATA


Concepts



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Copyright IBM Corp., 2000, 2004. All rights reserved. Page 79 of 80Introduction


Understand how to assign default values to parameters

Accept default values for parameters

Nullify default values for parameters

Topic Summary


Summary



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Now that you have completed this unit, you should be able to:

Understand the purpose and form of the DDNAMEparameter in a procedure definition

Resolve the DDNAME parameter when executing aprocedure by identifying the actual data set names and

attributes represented by the DDNAME parameter

Understand the purpose and form of symbolicparameters in a procedure definition

Assign values to symbolic parameters at the time ofinvoking a procedure

Unit Summary

Unit: Symbolic Parameters

jcl nivel intermedio unidad 6

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