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Some COOL JCL Interview Questions

 
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PrasadV

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Joined: 21 Mar 2004
Posts: 8
Location: Chennai

PostPosted: Sat Apr 03, 2004 2:57 pm    Post subject: Some COOL JCL Interview Questions
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Hi guys,

pls. try to get me the answers for the following questions:

1. What parameter is used to limit the no. of records to be written in sysout.

2. what is the use of KeyLen in dd statement?

3. What does INHIBIT in an Alter statement do on a dataset?

4. Base Cluster should be deleted before deleting an AIX. (True/False).

5. What will happen if we load an empty ksds to an AIX?

6. What does DD DUMMy do?

7. What is RACF?

8. RD=R, what does it mean?

9. How do u calculate RBA?

10. I have a dd coded as (NEW,CATLG,KEEP) in job-1 step-1. if the job-1 fails? how can i access the same dataset in job-2 step-2?.. is it really possible?
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bluebird

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Joined: 03 Feb 2004
Posts: 127

PostPosted: Mon Apr 05, 2004 4:59 pm    Post subject:
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thoses questions are basic JCL questions.
you can find answers to this in www.ibmmainframes.com/downloads.php
l
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mvs_butta

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Joined: 23 Dec 2003
Posts: 13

PostPosted: Tue Apr 06, 2004 8:03 am    Post subject:
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1. What parameter is used to limit the no. of records to be written in sysout.

Use the OUTLIM parameter to limit the number of logical records in the sysout data set

2. what is the use of KeyLen in dd statement?

KEYLEN parameter to specify the length of the keys used in a new data set.
3. What does INHIBIT in an Alter statement do on a dataset?

By using INHIBIT option with ALTER command , you can make VSAM data set as read-only.

6. What does DD DUMMy do?
For a dummy data set, the system bypasses all input/output operations, does not allocate devices or storage
to the data set, and does not perform disposition processing.
When an attempt is made to read , return as end-of-file
when an attemt to write , the request is recognized but no data is transmitted
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bluebird

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Joined: 03 Feb 2004
Posts: 127

PostPosted: Tue Apr 06, 2004 12:05 pm    Post subject:
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hello,

RACF is Ressource Access Control Facilty basically it's security product from IBM

10 is access the DS using disp=SHR in your JCL deck (next run)
disp=new (created at start), catalog (DS catalogued at end of job), delete(DS DELETED if step abends)

5 is impossible (it fiails with a rc see older posts in VSAM JCL post)

hope it helped
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mdtendulkar

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Joined: 29 Jul 2003
Posts: 238
Location: USA

PostPosted: Tue Apr 06, 2004 1:02 pm    Post subject:
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Hello PrasadV,

Check out the following link for more details

OS 390 MVS JCL Reference


1) OUTLIM Parameter ---> Page 32

2) KeyLen parameter ---> Page 229

3) What does INHIBIT in an Alter statement do on a dataset?
INHIBIT decides the type of access available to do certain types of operations
VSAM VSE Commands ---> Page 113

4. Base Cluster should be deleted before deleting an AIX. (True/False).
5. What will happen if we load an empty ksds to an AIX?
Check out this link for more details

6. What does DD DUMMy do?
---> Page 211

7. What is RACF?
Resource Access Control Facility

8. RD=R, Page ---> 370

10. I have a dd coded as (NEW,CATLG,KEEP) in job-1 step-1. if the job-1 fails? how can i access the same dataset in job-2 step-2?.. is it really possible?
In JOB-1 STEP-1 if the job fails...the dataset will not be CATLG so you wont be able to retrieve it unless you have the VOL=SER for the dataset.

Hope this helps,

Regards
Mayuresh Tendulkar
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mmwife

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Joined: 30 May 2003
Posts: 1592

PostPosted: Sat Apr 10, 2004 12:43 am    Post subject:
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Hi,

Some info on Ques. #9.

To get the RBA of a record:

Fixed length - multiply the LRECL by the record# - 1. E.g., for record# 10 of an 80 byte record file:

(10 -1) * 80 = 720 = RBA

Variable length - total the byte count of all the records that came before the one you're interested in. E.g., If you want the RBA of the 10th record add the lengths of records 1 through 9. Note that these are not the variable rcords that contain 4 byte BDW/RDWs at the start of a block of data or a record. They only contain application data and they are not blocked.

HTH, Jack.
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