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Difference between overriding and symbolic parameters
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karthi_ind

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PostPosted: Tue Jan 12, 2010 11:42 am    Post subject: Difference between overriding and symbolic parameters
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Hi all,

Following are the questions asked in IBM interview

1) difference between overriding and symbolic parameters
Ans - In symbolic the value for the symbolic is supplied when the PROC is invoked, in overriding it replaces the PROC's statement with another one.

2) Types of overriding parameter

3) how to execute only a particular step in a proc, for example there are 4 steps in a proc and I need to only execute step 3 and not step 1, 2 or 4. This I have to do in job itself.
Ans - COND.STEPNAME

4) how to split the input file into 5 output files with equally distributing the records to each files. letz say if the input file has 100 records then each file will have 20 recs.
This we can do by using DFSORT or SYNCSORT. But I want to know the actual code for this.

Can anyone please elaborate answers for each questions and correct me if the answer is wrong.

Thanks
Karthik
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Anuj Dhawan

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PostPosted: Tue Jan 12, 2010 1:45 pm    Post subject:
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Let's start with - What were your answers?
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PeterHolland

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PostPosted: Tue Jan 12, 2010 1:51 pm    Post subject:
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Anuj Dhawan wrote:
Let's start with - What were your answers?


As far as i see it, only question 2 was not answered.
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expat

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PostPosted: Tue Jan 12, 2010 2:10 pm    Post subject:
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Anuj Dhawan wrote:
Let's start with - What were your answers?

Anuj, I think that you need some new glasses mate 36_2_51.gif
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karthi_ind

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PostPosted: Tue Jan 12, 2010 2:55 pm    Post subject: Reply to: Interview Questions
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Hi Guys,

I answered whatever i know. Thanks.
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Anuj Dhawan

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PostPosted: Tue Jan 12, 2010 3:41 pm    Post subject:
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Now as I'm beaten up a bit and new pair of glasses are on their way... icon_smile.gif

1. Symbolic Parameters are used to override the parameters of an EXEC/DD statement. There are 2 types:

a. System Symbols Ex: &SYSUID
b. JCL Symbols (Symbolic Parameter)

Override parameters are used to override or to counteract the force or effectiveness of (or nulllify) DD/EXEC statements on the fly.

2. I'm not pretty sure if there are more feathers to this question, however, you can override an in-stream or cataloged procedure by following types
  • Overriding, nullifying, or adding EXEC statement parameters
  • Overriding, nullifying, or adding parameters to DD or OUTPUT JCL statements
  • Adding DD or OUTPUT JCL statements

3. If step003 is a not a PROC, RESTART=STEP003,COND=(0,LE) on the jobcard.

4. A straight forward answer is, use the below JCL:
Code:
//S1     EXEC PGM=SORT
//SYSOUT   DD SYSOUT=*
//SORTIN   DD DSN=input.file,...
//SORTOF01 DD DSN=output.file1,...
   .
   .
   .
//SORTOF05 DD DSN=output.file05,...
//SYSIN    DD *
  SORT FIELDS=COPY
  OUTFIL FILES=(01,02,03,04,05),SPLIT
/*
but the twisted side of the question is, will the input file always contain an even multiple of 5 (e.g. 100, 200) or can it contain extra records (e.g. 102). If it can contain extra records, how do you want the records split among the 5 files when you have 102 records? Must the extra 2 records go to the fifth file or can they go to the first file or what?
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dick scherrer

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PostPosted: Tue Jan 12, 2010 10:35 pm    Post subject:
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Hello,

Questions 3 and 4 have been forum topics multiple times. Suggest you search the forum and if you find something that is unclear, post what you found and your doubt. Someone will be able to clarify.

Also, i'm not sure why question 3 is asked so often (i suppose the interviewers just don't know any better). None of the systems i have ever supported does this. It is rather common to restart from some point and complete a job, but to run only step 3 of 7 just is not needed. . .
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karthi_ind

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PostPosted: Wed Jan 13, 2010 10:26 am    Post subject: Reply to: Interview Questions
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Thanks Anuj.
Thanks Dick.

I have few clarifications on your answers

For the 3rd question you have mentioned that we can give
restart=step003,cond(0,le) but step003 is available in proc
so do we need to mention proc also in restart like
restart=proc1.step003,cond(0,le).. am i correct? I also need to
execute only this step alone.

For 4th question if the records are not equal like 102 or 104 then those needs to be written in the last file i.e 5th file. so how can we code this in SORT logic.
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dick scherrer

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PostPosted: Wed Jan 13, 2010 8:22 pm    Post subject:
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Hello,

Quote:
so do we need to mention proc also in restart like
restart=proc1.step003,cond(0,le).. am i correct?
If there is only one PROC there is no need to name it in the restart.

Your "new" question 4 is not the same as the original. Actually, this new question does not seem to even be related to the original - one is to "split the file" and the other looks at values within the file. Examples of both have been previously discussed.

If you are unwilling or unable to do some research/work on your own, it will be a very long next several years. . .
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Anuj Dhawan

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PostPosted: Wed Jan 13, 2010 8:38 pm    Post subject:
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As Dick has suggested, please make use of search button, if it does not work - I'll have some work for McMillian...icon_smile.gif
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Ajay Baghel

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PostPosted: Thu Jan 14, 2010 12:09 pm    Post subject:
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Q3 Restart the job from STEP3 and edit cond parameter to COND=(0,LE) in step4.

Alternatively, you can use IEBEDIT to selectivley executes steps in a JCL

Q4
SPLIT --> will move 1st rec to first o/p file, 2nd rec to second file and so on. On reaching last file, next record is moved to first file and so on in cyclic order.
SPLITBY=N-->will move 1st N recs to first o/p file, next N recs in input to second file and so on. On reaching last file, next N recs are moved to first file and so on in cyclic order.

SPLIT1R=N-->will move 1st N recs to first o/p file, next N recs in input to second file and so on. On reaching LAST file, "all the remaining records in input file" are moved to last file. No cyclic order here.
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gcicchet

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PostPosted: Fri Jan 15, 2010 6:39 am    Post subject:
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Hi Dick,

Quote:
If there is only one PROC there is no need to name it in the restart.


I don't think the above is correct, as far as I know and my tests reveal, you must code stepname.procstepname for restarting a PROC.


If you are overriding a DDNAME in a single step PROC, you don't need to code stepname.ddname


Gerry
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karthi_ind

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PostPosted: Fri Jan 15, 2010 11:22 am    Post subject: Reply to: Interview Questions
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Thanks All.

Ajay - I tried all Split commands and it is working fine. Thanks for that.

Karthik
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dick scherrer

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PostPosted: Fri Jan 15, 2010 9:30 pm    Post subject:
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Hi Gerry,

Possibly we are not "on the same page". . .

I didn't have anything handy to run to post as an example but this:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/handheld/Connected/BOOKS/iea2b680/20.23.2
and this:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/handheld/Connected/BOOKS/iea2b680/20.23.6
do not have procstepname in the restart - just the stepname.

What might i be missing?
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gcicchet

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PostPosted: Sat Jan 16, 2010 3:19 pm    Post subject:
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Hi Dick,

this may or may not make more sense icon_lol.gif

http://www.ibmmainframes.com/post-6914.html

Also here is some output from 2 tests I carried out



Code:
0                                                                               
 20.05.43 JOB00498  IRR010I  USERID XXXXXLC  IS ASSIGNED TO THIS JOB.           
 20.05.43 JOB00498  ICH70001I XXXXXLC  LAST ACCESS AT 20:00:38 ON SATURDAY, JANU
 20.05.43 JOB00498  $HASP373 XXXXXLB1 STARTED - INIT 27   - CLASS P - SYS XXXA 
 20.05.43 JOB00498  IEF403I XXXXXLB1 - STARTED - TIME=20.05.43                 
 20.05.43 JOB00498  -XXXXXLB1 GO       STEP0002    00      7      1    .00    .0
 20.05.43 JOB00498  IEF404I XXXXXLB1 - ENDED - TIME=20.05.43                   
 20.05.43 JOB00498  -XXXXXLB1 ENDED.  NAME-                     TOTAL TCB CPU TI
 20.05.43 JOB00498  $HASP395 XXXXXLB1 ENDED                                     
0------ JES2 JOB STATISTICS ------                                             
-  16 JAN 2010 JOB EXECUTION DATE                                               
-            7 CARDS READ                                                       
-           36 SYSOUT PRINT RECORDS                                             
-            0 SYSOUT PUNCH RECORDS                                             
-            2 SYSOUT SPOOL KBYTES                                             
-         0.00 MINUTES EXECUTION TIME                                           
         1 //XXXXXLB1 JOB GERRY,'',                                             
           //             CLASS=P,                                             
           //             MSGCLASS=X,                                           
           //             REGION=6M,RESTART=GO.STEP0002                         
           //*                                                                 
         2 //JCLLIB   JCLLIB ORDER=(XXXXXLC.JCL.CNTL)                           
         3 //GO       EXEC PROC4                                               
         4 XXA        PROC                                                     
         5 XXSTEP0001 EXEC PGM=IEFBR14                                         
         6 XXSTEP0002 EXEC PGM=IEFBR14                                         
  STMT NO. MESSAGE                                                             
         3 IEFC001I PROCEDURE PROC4 WAS EXPANDED USING PRIVATE LIBRARY XXXXXLC.J
 ICH70001I XXXXXLC  LAST ACCESS AT 20:00:38 ON SATURDAY, JANUARY 16, 2010       
 IEF142I XXXXXLB1 STEP0002 GO - STEP WAS EXECUTED - COND CODE 0000             
 IEF373I STEP/STEP0002/START 2010016.2005                                       
 IEF374I STEP/STEP0002/STOP  2010016.2005 CPU    0MIN 00.00SEC SRB    0MIN 00.00
 IEF375I  JOB/XXXXXLB1/START 2010016.2005                                       
 IEF376I  JOB/XXXXXLB1/STOP  2010016.2005 CPU    0MIN 00.00SEC SRB    0MIN 00.00


Code:
 20.04.45 JOB00493  IRR010I  USERID XXXXXXC  IS ASSIGNED TO THIS JOB.     
 20.04.45 JOB00493  IEF430I RESTART STEP NOT FOUND FOR JOB XXXXXXB1       
 20.04.45 JOB00493  IEF452I XXXXXXB1 - JOB NOT RUN - JCL ERROR           
 20.04.45 JOB00493  $HASP396 XXXXXXB1 TERMINATED                         
0------ JES2 JOB STATISTICS ------                                       
-  16 JAN 2010 JOB EXECUTION DATE                                         
-            7 CARDS READ                                                 
-           27 SYSOUT PRINT RECORDS                                       
-            0 SYSOUT PUNCH RECORDS                                       
-            1 SYSOUT SPOOL KBYTES                                       
-         0.00 MINUTES EXECUTION TIME                                     
         1 //XXXXXXB1 JOB GERRY,'',                                       
           //             CLASS=P,                                       
           //             MSGCLASS=X,                                     
           //             REGION=6M,RESTART=STEP0002                     
           //*                                                           
         2 //JCLLIB   JCLLIB ORDER=(XXXXXXC.JCL.CNTL)                     
        3 //GO       EXEC PROC4                                               
        4 XXA        PROC                                                     
        5 XXSTEP0001 EXEC PGM=IEFBR14                                         
        6 XXSTEP0002 EXEC PGM=IEFBR14                                         
 STMT NO. MESSAGE                                                             
        3 IEFC001I PROCEDURE PROC4 WAS EXPANDED USING PRIVATE LIBRARY XXXXXXC.
        1 IEF661I RESTART STEP NOT FOUND                                     



Gerry
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dick scherrer

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PostPosted: Sat Jan 16, 2010 6:34 pm    Post subject:
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Hi Gerry,

The posted jcl error is from a job that appears to use multiple procs - in which case procstepname would be required.

My observation is for jobs that use only one proc. . . Which is about 99% of our production jobs - which are the ones most likely to be restarted. . .
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gcicchet

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PostPosted: Sun Jan 17, 2010 1:41 am    Post subject:
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Hi Dick,

Quote:
The posted jcl error is from a job that appears to use multiple procs -


In the posted JCL, I don't see the use of mutiple PROCS, it's one PROC with 2 steps, each step executing PGM=IEFBR14.

If mutiple PROC's was being used, the output would show mutiple lines of this
Code:
3 IEFC001I PROCEDURE PROC4 WAS EXPANDED USING PRIVATE LIBRARY


Gerry
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kumar119119

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PostPosted: Thu Oct 21, 2010 12:36 pm    Post subject:
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Hi Gerry,

I read the above post,
I understood one thing,
i.e

dick scherrer,said that
If a JOB has single PROC we use RESTART=STEP2,
here STEP2=procstepname,
no need to give RESTART=jobstepname.procstepname,

But,
You provided the spool info. on this & you said

RESTART=jobstepname.procname
is must for single proc/ two or more procs

is my understanding correct or not?
please tell me,

Thanks in advance.
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Anuj Dhawan

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PostPosted: Thu Oct 21, 2010 8:02 pm    Post subject:
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Just a suggestion - Why not you also do an experiment like Gerry did?
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kumar119119

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PostPosted: Thu Oct 21, 2010 8:11 pm    Post subject:
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Hi Anuj Dhawan,
Good Evening,

Actually I released from the project,
I need to join in a week in another MNC,

So I can't do anything,

So, Please tell me this,

is RESTART=procstepname sufficient instead of RESTART=jobstepname.procstepname ?

Please tell me,
else sorry, I will stop asking

Thank you.
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