Answer / sunitha

Ans: The DD statement links the external dataset to the
ddname coded within the executing program. It links the
files within the program code to the filenames known to the
MVS Operating system. The syntax is:
//DDANAME DD DSN=NAME,
// DISP=(NEW,CATLG,DELETE),
// DCB=(DSORG=PS,RECFM=FB,LRECL=80,BLKSIZE=800),
// SPACE=(CYL,(20,5),RLSE),
// UNIT=SYSDA

DSN- Name of the dataset- separated by periods, each name 1
to 8 characters, total 44 chars including periods.
DISP- It specifies the disposition of the dataset.
DISP=(status,normal-disposition,abnormal-disposition)
Status – The statuses NEW,MOD,OLD,SHR are the status of the
dataset at the beginning of the step.
NEW is given to create a new dataset. It is the default if
anything is not coded.
OLD designates an existing dataset with exclusive control.
SHR designates an existing dataset without exclusive
control.
MOD is used to extend the dataset if it exists or to create
a new one if it does not exist.
Normal-disposition- It directs the system on the
disposition of the data set (pass, keep, catlg, uncatlg,
delete) when the step ends normally.
Abnormal-disposition- It directs the system on the
disposition of the data set (keep, catlg, uncatlg, delete)
when the step ends abnormally.
DCB- Physical characteristics of a Data Set are described
by DCB Parameters. These parameters must be coded for newly
created data set as well as for existing Datasets.
• LRECL=n (VALUE IN BYTES)
• RECFM=(F/FB/V/VB/U)
• BLKSIZE= multiple of LRECL
• DSORG=(PS/PO/DA)
PO: specifies a partitioned Organization, DA: specifies a
direct organization.
SPACE=(space units,
(primary,secondary,dir),RLSE,CONTIG,MXIG,ROUND)
space unit - TRK(tracks)/CYL(cylinders)/BLOCKSIZE in bytes.
In our above example it allocates 20 cycles primary and if
required allocates 5 secondary cycles.
RLSE- Request to release the space that is primarily
allocated if unused.
CONTIG- Request for contiguous space.
MXIG- Request for large area of contiguous space.
ROUND- Request for entire cylinder for storage of dataset.
UNIT parameter indicates the information about input or
output device that will be used
by the dataset. It specifies a group name, device type, or
device number that identifies the
device where the file resides. The Format of the UNIT
parameter is UNIT= groupname/
device-type/device number.
VOL parameter is primarily used for tapes. A volume is the
portion of the storage device served by one read/write
mechanism. To request specific volumes, we code
VOL=SER=volume for one volume or VOL=SER=(volume, volume…)
for multiple volumes. Volume serial numbers are one to six
characters.
SYSOUT parameter is used to route the output to a device.
// DDNAME DD SYSOUT=CLASS

Answer / guest

The DD statement links the external dataset name (DSN) to
the DDNAME coded within the executing program. It links the
file names within the program code to the file names know to
the MVS operating system. The syntax is // ddname DD
DSN=dataset name. Other keywords after DSN are DISP, DCB,
SPACE, etc.

Max. No of DD statements in a job ?

4 Answers   CSI,

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Explain how can a jobs execution priority be modified?

1 Answers  

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COND -> step1 . . step2, Step2, Executes if the CC of step1 is 0. But even if it is NOT 0 and if we dont give COND, will step2 be executed ?

4 Answers   IBM,

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I have 5 steps in my jcl ,I need to execute first three steps and then 2nd step again ,4th and 5th steps if rc of 2nd step is zero

1 Answers   ABC,

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List some valid operation codes in JCL

3 Answers  

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oza017.myorg.emp has 100 records ,oza018.myorg.staff has 200 records but 50 are the common records in both files copy all the common records into oza017.myorg.xyz dataset

3 Answers   Cognizant,

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Does the terms, JOBLOG, SPOOL and SYSOUT indicate the same thing, i.e., where JCL and JES messages and statements are written ?

2 Answers  

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how to purge 50 initiators continuously?? console commands??

4 Answers   IBM, ups,

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If i have defined an temperory dataset in step2, how can i call back or use the same dataset in step5 of the same job

4 Answers   UST,

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how can u understand ps and pds from their names ?

1 Answers   TCS,

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What is the meaning of data definition name (ddname) and dataset name (dsname) in the DD statement?

2 Answers  

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There is a procedure in A.B.PROCS(PROC1) (member name is PROC1) //PROCA... There is a call to a procedure PROCA from a JOB. //STEP01 EXEC PROCA ... Here "PROCA" in JOB refers to the actual PROC name or the member name of the PDS where this PROCA is stored.

2 Answers   Merrill Lynch,

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