JCL Interview Questions

muthukumarapandian · Posted: Wed Mar 09, 2005 7:44 pm

Hi,

In one interview i faced the following questions

1) How to refer the entire versions of GDG by single specification?

2) what is the diff bet DEST in DD and SYSOUT in DD statements?

3) How to compress the dataset using IEBGENER and IEBCOPY?

4) Can u code job steps inside procedures ? how many steps?

5) If i specify Disp = mod what are the other default sub parameters?

ovreddy · Posted: Thu Mar 10, 2005 1:43 pm

1. Just specify the name of the GDG without using generation number i.e.

//IN1 DD DSN=SAMPLE.MYGDG

2 The SYSOUT parameter identifies a data set as a "SYStem OUTput" data
set, consisting of printed output . The SYSOUT parameter names the output class to which the printed output belongs.

The DEST parameter specifies a destination for a SYSOUT data set.
The destination can be a local or remote terminal, a node in the JES
network, a local or remote printer or workstation, or even a TSO
userid. DEST is only valid for a SYSOUT DD statement, and it has to
name a valid destination that is already known to your JES.

3.When COMPRESS is specified in PARM of EXEC statement, then the generated statement is:

COPY OUTDD=SYSUT2,INDD=SYSUT2

which will compress in place the
data set designated by the SYSUT2 DD statement.

//JS10 EXEC PGM=IEBCOPY,REGION=1M
//SYSPRINT DD SYSOUT=*
//I1 DD DSN=my.pds,
// DISP=OLD
//* Same PDS for Input & Output
//O1 DD DSN=my.pds,
// DISP=OLD
//SYSIN DD *
COMP1 C O=O1,I=((I1,R))

5. MOD Indicates one of the following, and that you need non-shared control of the data set:

a) The data set already existed, and that records are to be added to
the end of the data set (for sequential files only)

b) You are creating a new data set

It will check for the dataset if exists it takes MOD otherwise it takes it as NEW.

Bye,
Reddy

Prandip · Posted: Tue Mar 15, 2005 11:46 am

srividya.srinivasan · Posted: Tue May 10, 2005 4:48 pm

Hi,

I would Like to add on the question related to Disposition.

The Default value for Disp is (NEW,DELETE,DELETE)

and the Default for MOD is (OLD,SHR,SHR).

Regards,
Vidya

notonly4u · New User Joined: 26 Apr 2005 Posts: 87 Location: Hyderabad

learnmf · Active User Joined: 14 Mar 2005 Posts: 123

learnmf · Active User Joined: 14 Mar 2005 Posts: 123

HI plz refer this
publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IEA2B650/12.19.3?SHELF=&DT=20040712170508&CASE=

asridhar · New User Joined: 04 May 2005 Posts: 5 Location: Hyderabad

Hi

The default for MOD IS (OLD, KEEP, KEEP)

srividya.srinivasan · Posted: Tue May 17, 2005 3:31 pm

Hi,

i agree with you, its OLD,KEEP,KEEP

Thanks,
Srividya