IBM MainFrame Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

COBOL (1072)
JCL (1031)
CICS (755)
DB2 (1122)

IMS (143)
IDMS (107)
Natural (81)
ADABAS (26)

REXX (60)
Assembler (68)
CLIST (6)
QMF (32)

MVS (25)
OS390 (10)
OS 2 (7)
VSAM (319)

IBM MainFrame Interview Questions

Questions Answers Views Company eMail

What is the meaning of VSAM RETURN-CODE 28?

3 21726

On which datasets You can have ALT INDEX?

2 6138

How many Alternate Indexes you can have on a dataset?

AB Inc,

2 9914

Is it slower if you access a record through ALT INDEX as compared to Primary INDEX? Why?

1 5955

Yes. Because the alternate key would first locate the primary key, which in turn locates the actual record. Needs twice the number of I/Os.

2413

What is RECOVERY and SPEED parameters in DEFINE CLUSTER command?

1 14326

Describe SHAREOPTIONS parameter (SHR) in Define Cluster command.?

1 17739

What does the KEYRANGES parameter in Define Cluster commend do?

1 7454

What are the optional parameters to the input dataset While loading the empty cluster with the data records?

IBM,

1 6183

What is IDCAMS? and what is the purpose of it?

4 18989

How to delete a member using JCL.?

5 15407

What is the Difference between LDS & ESDS ?

3 15315

Is a delete operation possible in an ESDS?B. Is rewrite operation possible in ESDS ?

3 10357

What is an alternate index and path ?

Infosys, TCS,

2 26739

How many buffers are allotted to VSAM KSDS and ESDS?

1 8237

Un-Answered Questions { IBM MainFrame }

What is the purpose of dd?

1234

How to find schema of a table in db2?

1010

What is the copy idms subschema-binds?

829

Explain the process in which flat files are converted into vsam files?

1001

What is the use of disp parameter?

1136

INREC AND OUTREC? HOW TO SPLIT 5K RECORDS TO DIFFERENT FILES IN A FILE IN COBOL? RESTART IN COBOL-DB2? ISOLATION LEVELS?

863

How does a cursor work?

982

What is catelog procedure and how many catelog procedure to use in one job?

8681

What is the meaning of a (new, catalog, keep) disposition mean?

1109

in a jcl, a large volume dataset is loaded to a table using bmcload in step1 and an image copy of the loaded table is taken using bmccopy in step2. Step2 abends because the image copy dataset cannot hold the volume of the table. How can this be rectified?

1297

What is a system catalog table in db2?

1184

Can a CICS code be a part of a copybook? If so, then what are the outcomes after compilation?

1119

Can any one tell me that how we go for the compare,unit testing after changing requirement as per client request. this is very helpful for me when u give suitable (coading) exmple.

2147

Explain dclgen.

1197

Explain the different ways of initiating transaction in cics?

946

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