jclb unit 1

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z/OS MVS JCL Intermediate

© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed.

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age 2 o% &'

Course Details

Audience

(hi" )o*r"e i" de"igned %or intermediate to ad#an)ed JCL "y"tem programmer", operator" and app!i)ation

programmer" +ho ha#e "ome no+!edge o% -a"i) JCL )oding.

Prerequisites

(hi" )o*r"e a""*me" that the "t*dent ha" the -a"i) no+!edge o% IS te)hno!ogie", data pro)e""ing, "o%t+are

and hard+are %rom OS/'0 Introd*)tion '013, OS/'0 MVS Con)ept" and a)i!itie" '0123 and OS/'0

JCL Introd*)tion '01'3 )o*r"e".

Introd*)tion

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age ' o% &'

Course Introduction

(he %ir"t *nit, Using Special DD Statements, di")*""e" "pe)ia! 55 "tatement" that )an e6tend a

programmer7" )apa-i!itie" and a#oid repetiti#e )oding.

(he Introducing Procedure *nit introd*)e" pro)ed*re", pre8)oded JCL that yo* )an -ring into a 9o- "tream

at the appropriate point to per%orm a parti)*!ar %*n)tion.

In the third *nit, Modifying EXEC Parameters, yo* !earn ho+ to modi%y operand" on pro)ed*re :;:C

"tatement" at the time o% in#oing a pro)ed*re.

(he Modifying DD Parameters *nit e6tend" the "i!!" de#e!oped in the third *nit, -y di")*""ing ho+ to add,

o#erride or n*!!i%y operand" on pro)ed*re 55 "tatement".

In the %i%th *nit, Determining the Effective C!, yo* !earn ho+ to ana!yze the e%%e)ti#e JCL.

(he %ina! *nit, Sym"olic Parameters, di")*""e" ho+ to a""ign #a!*e" to 55

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t the end o% thi" )o*r"e, yo* +i!! -e a-!e to=

• >"e -a)+ard re%eren)e %eat*re +ith the $?M, 5S

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>"ing Spe)ia! 55 Statement"

>"ing Ba)+ard Ae%eren)e

Con)atenating 5ata Set"

5*mmy 5ata Set"

Storage 5*mp"

(opi)"=

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age o% &'

(hi" *nit de")ri-e" the p*rpo"e, %*n)tion and the %ormat o% )ertain "pe)ia! 55 "tatement" !ie -a)+ard

re%eren)e".

(hi" *nit a!"o de")ri-e" 55 "tatement" that )an -e *"ed to )on)atenate data "et" and identi%y d*mmy data

"et".

55 "tatement" that re@*e"t "torage d*mp" are a!"o di")*""ed in thi" *nit.

Unit Introduction

Unit: Using Special DD Statements

Introd*)tion

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age & o% &'

t the end o% thi" *nit, yo* +i!! -e a-!e to=

• Code a 55 "tatement to *"e in%ormation %rom pre)edingJCL "tatement"

• Identi%y the p*rpo"e o% data "et )on)atenation

• Code JCL to )on)atenate a data "et

• Code a 55 "tatement to indi)ate that a data "et i" to -eignored %or the )*rrent program e6e)*tion

• Identi%y the p*rpo"e o% "pe)ia! ddname"

Unit #"$ectives


Introd*)tion

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5*mmy 5ata Set"

Storage 5*mp"

(opi)"=

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t the end o% thi" topi), yo* +i!! -e a-!e to=

• 5e%ine a -a)+ard re%eren)e

• Identi%y %o*r )ommon -a)+ard re%eren)e"

• :6p!ain the importan)e o% ea)h o% the -a)+ardre%eren)e"

%opic #"$ectives

Unit: Using Special DD Statements Topic: Using Backward Reference

Introd*)tion

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&hat is 'ac()ard *eference+

typi)a! JCL 9o- "tep may *"e or )reate a

n*m-er o% data "et", ea)h re@*iring a #ariety o%

parameter #a!*e".

Ba)+ard re%eren)e i" a )oding te)hni@*e that

dire)t" the "y"tem to )opy parameter #a!*e" %rom

pre)eding 55 "tatement" +ithin the )*rrent 9o-.

,o) does this technique help+

Ba)+ard re%eren)e te)hni@*e i" more e%%i)ienta"

it "a#e" the programmer %rom repetiti#e )oding o%

in%ormation.

'ac()ard *eference


55 $AM:(:AS

$?M VOL

5S< 5CB

Con)ept"

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o*r )ommon -a)+ard re%eren)e" are=

• $?M Ae%eren)e= $oint" to a pre#io*" data "et to "pe)i%y a program name

• 5S< Ae%eren)e= $oint" to a pre#io*" data "et name

• VOL Ae%eren)e= $oint" to a pre#io*" #o!*me "eria! n*m-er

• 5CB Ae%eren)e= $oint" to 5CB attri-*te" de%ined in another pre#io*" 55 "tatement

%ypes of 'ac()ard *eferences


Con)ept"

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Synta- for 'ac()ard *eference

(he genera! %orm o% a -a)+ard re%eren)e i" a"

%o!!o+"=

• (o re%er -a) to a prior 55 "tatement

+ithin the "ame 9o- "tep=

Keyword=*.ddname

• (o re%er -a) to a 55 "tatement in a

prior 9o- "tep=

Keyword=*.stepname.ddname

• (o re%er -a) to a 55 "tatement

)ontained in a )ata!oged pro)ed*re

)a!!ed -y a pre#io*" "tep=

Keyword=*.stepname.procstep.

ddname

(he ey+ord in ea)h "tatement i" either

$?M, 5S

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%he general form of a "ac()ard r eference to a DD statement in a previous $o" step is

.ey)ord /00000000000001

Are &e on %rac(+


Ae#ie+

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Match the "ac()ard reference )ith the parameter to )hich it points1

. $?M re%eren)e . pre#io*" #o!*me "eria! n*m-er

2. 5S< re%eren)e B. pre#io*" data "et "pe)i%ying a program name

'. VOL re%eren)e C. 5CB attri-*te" de%ined in a pre#io*" 55 "tatement

4. 5CB re%eren)e 5. pre#io*" data "et name

Are &e on %rac(+


Ae#ie+

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P2M 'ac()ard *eference

&hat is P2M 'ac()ard *eference+

$?M -a)+ard re%eren)e i" a )oding te)hni@*e that point" to a prior 55 "tatement +hi)h "pe)i%ie" a

mem-er o% a program !i-rary.


$?M -a)+ard re%eren)e i" *"e%*! in a program de#e!opment en#ironment, in +hi)h the o*tp*t %rom one

9o- "tep typi)a!!y a !inage edit "tep3 may -e)ome the program to e6e)*te in a "*-"e@*ent "tep. In "*)h a

)a"e, in"tead o% naming the program, yo* )an )ode a $?M -a)+ard re%eren)e.


Con)ept"

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(he genera! %orm o% a $?M -a)+ard re%eren)e i" a" %o!!o+"=

//STEP EXEC P$%=*.stepname.ddname

Synta- for P2M 'ac()ard *eference


Con)ept"

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$?M -a)+ard re%eren)e i" o%ten *"ed %o!!o+ing a !inage edit "tep, in +hi)h a !oad mod*!e program3 i"

"tored in a temporary data "et. $?M -a)+ard re%eren)e i" *"ed in )oding a !ater "tep that e6e)*te" the

program. (he re%eren)e "pe)i%ie" the data "et )ontaining the program %rom the pre#io*" "tep.

P2M 'ac()ard *eference 3 E-ample 4


Con)ept"

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P2M 'ac()ard *eference 3 E-ample 5

In the e6amp!e "ho+n, the LI

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Assume that in step C of a $o"6 you )ant to e-ecute P*#2' using a P2M "ac()ard reference1%he program is specified in S%EPA on a DD statement )ith ddname !.ED#U%1 Complete thefollo)ing code1

//STEPC EXEC P$%= GGGGGGGGGGGGGGG

Are &e on %rac(+


Ae#ie+

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&hich of the follo)ing statements are true for a P2M "ac()ard reference+

. It i" )oded on 55 "tatement.

B. It o%ten %o!!o+" a LI

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&hat is DS7 'ac()ard *eference+

(he 5S< -a)+ard re%eren)e i" a )oding te)hni@*e that re%er" to a prior 55 "tatement that name" the

data "et yo* +ant to pro)e"".


(hi" te)hni@*e i" *"e%*! +hen )oding 9o-" that )on"i"t o% "e#era! "tep", +ith m*!tip!e re%eren)e" to the "ame

data "et. (he re%eren)e )an a!"o -e *"ed to retrie#e temporary data "et" in "*-"e@*ent 9o- "tep", +itho*t

no+ing the name.

DS7 'ac()ard *eference


Con)ept"

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(he genera! %orm %or the 5S< -a)+ard re%eren)e i" a" %o!!o+"=

DS=*.stepname.ddname

Synta- for DS7 'ac()ard *eference


Con)ept"

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age 2' o% &'

DS7 'ac()ard *eference 3 An E-ample

Con"ider a payro!! 9o- )on"i"ting o% "e#era! "tep",

a!! re%erring to the "ame data "et. (he 9o- need"

to -e e6e)*ted ea)h +ee *"ing a data "et that

)ontain" the +ee7" tran"a)tion".

(hi" re@*ire" that, ea)h +ee the data "et name

m*"t -e )hanged in the order F::, F::2and "o on.

By *"ing a 5S< -a)+ard re%eren)e, the data "et

)an -e retrie#ed ea)h +ee -y )hanging on!y one

55 "tatement, 55.

Contin*edH


//STEP1 EXEC P$%=PO$1

//DD1 DD 'T=S(SD!,

// 2O&=SE=P!CK1".SP!CE=3,",","++,

// D'SP=E-,P!SS+,DS=-EEK1

//STEP" EXEC P$%=PO$"

//DD" DD DS=*.STEP1.DD1.D'SP=O&D,KEEP+

Con)ept"

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A DS7 "ac()ard reference points to a 000000000 in a prior DD statement1

Are &e on %rac(+


Ae#ie+

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Code a DS7 "ac()ard reference that refers to a data set in S%EP56 ddname 8DD9:1

DS= 44444444444444

Are &e on %rac(+


Ae#ie+

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&hat is ;#! 'ac()ard *eference+

VOL -a)+ard re%eren)e i" a )oding te)hni@*e that point" to the #o!*me "eria! n*m-er o% an e6i"ting

data "et.


(he VOL -a)+ard re%eren)e i" *"e%*! +hen yo* +ant to )reate a ne+ data "et on the "ame #o!*me on

+hi)h an e6i"ting data "et re"ide", -*t yo* do not no+ the #o!*me identi%i)ation.

;#! 'ac()ard *eference

(he VOL parameter "pe)i%ie" the media

#o!*me on +hi)h a data "et re"ide".


Con)ept"

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age 2& o% &'

(he genera! %orm o% the VOL -a)+ard re%eren)e i" "ho+n -e!o+=

//ddname DD 52O&=E6=dsname

Synta- for ;#! 'ac()ard *eference


Con)ept"

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Con"ider an e6amp!e +here $AO? )reate" and )ata!og" a data "et named ;D. ;D i" to re"ide on the

"ame #o!*me a" an e6i"ting, pre#io*"!y )ata!og*ed data "et named BC.

(o re%er the "y"tem to data "et BC, a VOL -a)+ard re%eren)e )an -e )oded a" %o!!o+"=

//STEP1 EXEC P$%=PO$!

//DD1 DD DS=X(7,

// D'SP=E-,C!T&$+,

// 2O&=E6=!BC

;#! 'ac()ard *eference 3 E-ample 4


Con)ept"

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;#! 'ac()ard *eference < E-ample 5

In thi" e6amp!e the -a)+ard re%eren)e re%er" to a

"pe)i%i) #o!*me "eria! n*m-er )oded on a prior

55 "tatement.

(he data "et ;D +i!! -e )reated on the #o!*me

re%erred to -y the 55 "tatement 552 #o!*me

2'413.


Con)ept"

//STEP! EXEC P$%=PO$!

//DD" DD DS=!BC,2O&=SE=1"#089,

// D'SP=S:,'T=S(SD!

//DD1 DD DS=X(7,

// D'SP=E-,C!T&$+,

// 2O&=E6=*.DD",5

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age '0 o% &'

Code a ;#! "ac()ard reference )hen=

data set XXX )ill reside on the same volume as data set >>>1

Are &e on %rac(+


Ae#ie+

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data set XXX )ill "e created on the volume identified in the DD statement )ith ddname DD41

Are &e on %rac(+


Ae#ie+

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data set XXX )ill "e created on the volume identified in S%EPC as DD51

Are &e on %rac(+


Ae#ie+

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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age '' o% &'

Match the underlined statements in the code )ith the definitions in the column on the right1

. VOLA:LM< . "tepname.ddname

2. VOLA:K.55 B. d"name

'. VOLA:K.S(:$.55 C. ddname

Are &e on %rac(+


Ae#ie+

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&hat is DC' 'ac()ard *eference+

5CB -a)+ard re%eren)e i" a )oding te)hni@*e that a!!o+" yo* to )opy a !i"t o% attri-*te" %rom a prior 55

"tatement in the "ame or pre#io*" 9o- "tep.


(hi" )oding te)hni@*e )an -e *"ed to en"*re that the 5CB parameter" are )on"i"tent +ithin the 9o-.

It )an a!"o -e *"ed to o#erride or add to the "*-parameter" )oded on a pre#io*" "tatement.

DC' 'ac()ard *eference


Con)ept"

/OS MVS JCL I di

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(he genera! %orm i" a" %o!!o+"=

//ddname DD DCB=*.stepname.ddname

Synta- for DC' 'ac()ard *eference


Con)ept"

/OS MVS JCL I t di t

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DC' 'ac()ard *eference 3 An E-ample

""*me that in S(:$2 yo* +ant to )reate adata "et +ith the "ame parameter" a" a data "et

in S(:$.

(he )ode "ho+n en"*re" that the attri-*te" on the

552 "tatement are the "ame a" tho"e on the 55

"tatement.



//DD1 DD DCB=EC6%=6B,

// &EC&=3,

// B&KS'7E=3+...

//STEP" EXEC P$%=PO$" //DD" DD DCB=*STEP1.DD1,...

Con)ept"


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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age '& o% &'

5CB -a)+ard re%eren)e )an a!"o -e *"ed too#erride or add to the "*-parameter" )oded on a

pre#io*" "tatement.

(he %ormat %or o#erriding a pre#io*" "tatement

i" a" %o!!o+"=

DCB=*.stepname.ddname,;

attr

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or e6amp!e, noti)e the 5CB )hara)teri"ti)" in"tatement 55 -e!o+=

//STEP# EXEC P$%=PO$#

//DD1 DD DCB=EC6%=6,

// B&KS'7E=3+,5

(he %o!!o+ing o#erride "tatement=

//DD" DD DCB=*.DD1,

// EC6%=6B,&EC&=3+

+o*!d re"*!t in the"e 5CB )hara)teri"ti)"=

//DD" DD DCB=EC6%=6B,

// &EC&=3,B&KS'7E=3+

DC' 'ac()ard *eference 3 #verriding 8cont?d:


Con)ept"

5CBA:CMB,

LA:CL0

BLSI:003

5CBA:CM,

BLSI:003


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%he portion of the $o" stream sho)n a"ove contains C! statements6 some of )hich areincomplete1

Complete those statements "y coding the appropriate "ac()ard references as follo)s=

%he data set name in statement @ refers to statement 51

Are &e on %rac(+

Ae#ie+

1. //CO%P'&E EXEC P$%=P&1

". //CO%POT DD 'T=S(SD!,2O&=SE=P!CK1",

// D'SP=E-,P!SS+,DS=))!#. //&KED EXEC P$%=&'KED'T

0. //&KED' DD D'SP=O&D,DS=4444444444

8. //S(S&%OD DD D'SP=E-,P!SS+,DS=))$OSET$O+,

// 2O&=44444444444444

9. //$O EXEC P$%=44444444444

A. //%(D!T! DD DS=%(D!T!,D'SP=E-,C!T&$+,

// 2O&=SE SP!CE=3,8+,

// DCB=EC6%=6B,&EC&=3,B&KS'7E=3+3. //TE%P DD 'T=S(SD!,DCB=44444444444



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%he volume in statement refers to statement 51

Are &e on %rac(+

Ae#ie+





0. //&KED' DD D'SP=O&D,DS=*.CO%P'&E.CO%POT


// 2O&=44444444444444

9. //$O EXEC P$%=44444444444


// 2O&=SE SP!CE=3,8+,



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%he program in statement B refers to statement 1

Are &e on %rac(+

Ae#ie+







// 2O&=E6=*.CO%P'&E.CO%POT

9. //$O EXEC P$%=44444444444


// 2O&=SE SP!CE=3,8+,



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%he DC' attri"utes in statement refer to statement 1

Are &e on %rac(+

Ae#ie+







// 2O&=E6=*.CO%P'&E.CO%POT

9. //$O EXEC P$%=E6=*.&KED.S(S&%OD


// 2O&=SE SP!CE=3,8+,



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55 Statement JCL "tatement that de")ri-e" ea)h data "et *"ed +ithin a 9o- "tep.

ddname 5ata de%inition name. *ni@*e name gi#en to ea)h data "et *"ed in a 9o- "tep.

Jo- Step (he 9o- )ontro! "tatement" that re@*e"t and )ontro! the e6e)*tion o% a program and

re@*e"t the re"o*r)e" needed to r*n the program. 9o- "tep i" identi%ied -y an

:;:C "tatement.

5ata "et" ny named )o!!e)tion o% data.

$arameter Va!*e" Varia-!e in%ormation that %o!!o+" a ey+ord parameter and an e@*a! "ign.

$?M n :;:C "tatement parameter that name" the program to e6e)*te.

5S< 55 "tatement parameter that name" the data "et.

2lossary

Contin*edH


?!o""ary


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VOL parameter on a 55 "tatement that re@*e"t" a "pe)i%i) #o!*me or #o!*me".

5CB 5ata Contro! B!o). parameter on a 55 "tatement that de")ri-e" the attri-*te"

o%

a data "et, "*)h a" -!o) "ize and re)ord %ormat.

Load Mod*!e n e6e)*ta-!e program that re"*!t" %rom a !in edit "tep.

SDSLMO5 55 name *"ed -y the !inage editor to +rite it" o*tp*t a !oad mod*!e or LMO53.

5IS$ 5e")ri-e" the "tat*" o% a data "et to the "y"tem and te!!" the "y"tem +hat to do

+ith

the data "et a%ter termination o% the "tep or 9o-.

2lossary 8cont?d:


?!o""ary


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5*mmy 5ata Set"

Storage 5*mp"

(opi)"=


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• 5e%ine data "et )on)atenation

• :6p!ain ho+ to )on)atenate data "et"

%opic #"$ectives


Introd*)tion

Topic: Concatenating Data Sets


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&hat is data set concatenation+

programmer )an )ode 55 "tatement" to re@*e"t that "e#era! data "et" -e )on)atenated.

5ata "et )on)atenation ena-!e" the "y"tem to pro)e"" "e#era! "eparate phy"i)a! data "et" a" one !ogi)a!

data "et.

Data Set Concatenation 3 Definition


Con)ept"



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Con"ider a )o"t !edger "y"tem to prod*)e amonth!y )o"t "*mmary %i!e. t the year end, it i"

re@*ired to pro)e"" a!! 2 month!y data "et" to

prod*)e an ann*a! report. !! the data "et" are

)on)atenated "o that they )an -e pro)e""ed

"e@*entia!!y.

In thi" e6amp!e, the program *"e" a ddname o%

L:5?:A and the month!y data "et" are named

J

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Concatenation of Data Sets

,o) to concatenate data sets+

o!!o+ing "tep" are in#o!#ed in )on)atenating data

"et"=

. Code a "tandard 55 "tatement %or the %ir"t

data "et on!y

2. dd a 55 "tatement +itho*t a ddname %or

ea)h data "et to -e )on)atenated

'. Se@*en)e the "tatement" in the order they

are to -e pro)e""ed


Contin*edH

Con)ept"

//ddname DD DS=J!.D!T!

// DD DS=6EB.D!T!

// DD DS=%!.D!T!



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,o) concatenation is useful+

>"ing )on)atenation, a program )an -e r*n +ith one or "e#era! inp*t data "et" -y mere!y )hanging the 55

"tatement.

Fhi!e )on)atenating data "et" the %o!!o+ing point" m*"t -e )on"idered=

• (he )on)atenated data "et" m*"t ha#e the "ame or )ompati-!e3 5CB "*-parameter".

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(he JCL here "ho+" the )on)atenation o% themonth!y data "et" )on"idered in the L:5?:A

e6amp!e.

(he !a"t data "et )on)atenated to L:5?:A i"

5:C.

(he o))*rren)e o% the ddname S>M indi)ate"

that the data "et CC(.3 i" to -e pro)e""ed

"eparate!y %rom the L:5?:A data "et".

C! for Data Set Concatenation 3 An E-ample


//&ED$E DD DS=J!,D'SP=S:// DD DS=6EB,D'SP=S:

.

.

.// DD DS=DEC,D'SP=S:

//S% DD DS=!CCT.1,D'SP=S:

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Consider three data sets named6 CUS%1,IS%#*>1U!6 CUS%1,IS%#*>1AP* and

CUS%1,IS%#*>1A7 )hich are to "e processed in this order1 %hey are to "e concatenated toCUS%1,IS%#*>1#C%6 to create a master customer list1

Put the follo)ing statements in order1

. // DD DS=CST.:'STO(.!P

B. //%!STCST DD DS=CST.:'STO(.OCT

C. // DD DS=CST.:'STO(.J!

5. // DD DS=CST.:'STO(.J&

Are &e on %rac(+


Ae#ie+



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Con)atenated data "et" 5ata "et" that are "eparate phy"i)a!!y, -*t pro)e""ed "e@*entia!!y a" one !ogi)a! data "et.

ddname 5ata de%inition name. *ni@*e name gi#en to ea)h data "et *"ed in a 9o- "tep.

5CB 5ata Contro! B!o). parameter on a 55 "tatement that de")ri-e" the attri-*te"

o% a data "et, "*)h a" -!o) "ize and re)ord %ormat.

2lossary


?!o""ary



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5*mmy 5ata Set"

Storage 5*mp"

(opi)"=


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• 5e%ine d*mmy data "et"

• 5e")ri-e the importan)e o% d*mmy data "et"

•

Spe)i%y d*mmy data "et" in 55 "tatement"

%opic #"$ectives


Introd*)tion

Topic: Dummy Data Sets


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:a)h data "et that i" re%erred -y a program"ho*!d

ha#e a ddname. (he JCL %or the program m*"t

)ontain the )orre"ponding 55 "tatement".

I% a data "et i" not )oded -y a 55 "tatement, then

the program +i!! a-norma!!y end B:

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&hat is a dummy data set+

d*mmy data "et i" a data "et %or +hi)h a!! Inp*t or O*tp*t I/O3 operation" are -ypa""ed.

"pe)ia! 55 "tatement, 55 5>MMD, i" *"ed to ignore a data "et d*ring the e6e)*tion o% a program.

,o) does it )or(+

Fhen a data "et i" a""igned d*mmy "tat*", a!! I/O operation" are -ypa""ed and de#i)e a!!o)ation, "pa)e

a!!o)ation and data "et di"po"ition are ignored.

Dummy Data Sets


Con)ept"



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5*mmy data "et" )an -e "pe)i%ied in 55 "tatement" -y doing one o% the %o!!o+ing=

• Coding 5>MMD a" the %ir"t 55 parameter

Synta6=

//ddname DD D%%(

• Coding 5S

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Con"ider a payro!! program named $Dthat pro)e""e" "eparate inp*t data "et". (he

ddname (IM:C5S re%er" to +ee!y time )ard"

and the ddname 5J>S( re%er" to ad9*"tment" to

pre#io*" pay period in%ormation.

(he 9o- "tream m*"t in)!*de=

//STEP! EXEC P$%=P!(

//T'%ECDS DD

//!DJST DD

.

. .

Dummy Data Sets 3 An E-ample


Con)ept"

Contin*edH



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:#en i% there are no ad9*"tment" %or $D pro)e"", 55 "tatement %or 5J>S( m*"t -e in)!*ded.

(o te!! the "y"tem that there i" no 5J>S( data "et )ode )an -e +ritten a" %o!!o+"=

//STEP! EXEC P$%=P!(

//T'%ECDS DD

//!DJST DD D%%(

I% the data "et de")ri-ed -y the 55 "tatement named 5J>S( i" re%erred to -y the $D program, an

immediate end8o%8%i!e o))*r". (he program +i!! )ontin*e a" i% it ha" pro)e""ed the entire data "et.

Dummy Data Sets 3 An E-ample 8cont?d:


Con)ept"



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>ou can specify a dummy data set "y coding DS7/ 000000000000 on the DD statement1

Are &e on %rac(+


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%he follo)ing C! contains statements to e-ecute a payroll update program called PA>*#!1PA>*#! reads a %*A7S data set for getting time card information and updates the PA>MAS% dataset1 A report of all transactions is created1 %he *EP#*% DD statement descri"es the report dataset1

#rder the follo)ing statements to ignore the report of transactions created "y PA>*#!1

. //%!STE DD DS=P!(%!ST.D'SP=O&D

B. //T!S DD DS=T!S,D'SP=S:

C. //EPOT DD D%%(

5. //STEP1 EXEC P$%=P!(O&

Are &e on %rac(+


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5*mmy 5ata Set"

Storage 5*mp"

(opi)"=


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• 5e%ine "torage d*mp"

• :6p!ain the ad#antage" and di"ad#antage" o% "toraged*mp"

• Identi%y the "pe)ia! ddname" *"ed in "torage d*mp"

%opic #"$ectives


Introd*)tion

Topic: Storage Dumps


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&hat are Storage Dumps+

Fhen a program a-norma!!y terminate", "torage

d*mp" are *"ed a" a de-*gging too! to %ind )!*e"

to the )a*"e %or a-norma! ending.

Storage d*mp" are not the mo"t e%%e)ti#ede-*gging too!.

(he main dra+-a)" o% "torage d*mp" are=

• (hey are di%%i)*!t to read "in)e they are

printed in he6ade)ima! )ode

• $rinting "torage d*mp" i" time

)on"*ming

Storage Dumps


Con)ept"



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Special DDnames

(he"e re"er#ed ddname" re@*e"t "torage d*mp" in the e#ent that a program terminate" a-norma!!y=

• SDS>5>M$=Ae@*e"t" a %ormatted d*mp o% the pro)e""ing program area. It i" mo"t genera!!y *"ed

%or de-*gging pro-!em program".

• SDSB:M$=Ae@*e"t" an *n%ormatted d*mp o% the pro)e""ing program area and the "y"tem

n*)!e*" in ma)hine8reada-!e %orm. It i" genera!!y dire)ted to tape or to dire)t a))e""

"torage3 to a!!o+ "*-"e@*ent pro)e""ing -y a d*mp ana!y"i" *ti!ity.


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© Copyright IBM Corp., 2000, 2004. !! right" re"er#ed. $age &0 o% &'

It i" ne)e""ary to p!an ahead %or a po""i-!e "toraged*mp.

(o o-tain a d*mp, the SDS>5>M$, SDSB:M$ 55 "tatement" m*"t -e )oded in

the JCL %or ea)h 9o- "tep %rom +hi)h a d*mp need"

to -e o-tained.

(he e6amp!e "ho+n *"e" SDS>5>M$ 55 "tatement.

I% S(:$ or S(:$2 terminate" a-norma!!y, the

"y"tem )reate" a d*mp o% the program "torage area.

,andling Storage Dumps



//S(SD%P DD S(SOT=X

//DD1 DD ...

//STEP" EXEC P$%=PO$"

//S(SD%P DD S(SOT=X

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Match the special ddname )ith its function

. SDSB:

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jclb unit 1

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