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WithoutBook LIVE Mock Interviews Mainframe Related interview subjects: 74

Interview Questions and Answers

Know the top Mainframe interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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The Best LIVE Mock Interview - You should go through before interview

Know the top Mainframe interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

What is a JCL (Job Control Language) in mainframes?

JCL is a scripting language used to define and execute job streams on mainframe systems.

Example:

JCL: //JOBNAME JOB ... //STEP1 EXEC PGM=PROGRAM1
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Ques 2

What is VSAM (Virtual Storage Access Method) in mainframes?

VSAM is a file storage access method used in mainframes to organize and retrieve data efficiently.

Example:

VSAM definition: IDCAMS DEFINE CLUSTER ...
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Ques 3

What is the purpose of DB2 in mainframes?

DB2 is a relational database management system (RDBMS) used in mainframes for storing and retrieving data.

Example:

SQL query: SELECT * FROM TABLE_NAME WHERE COLUMN = 'VALUE';
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Ques 6

Explain the concept of a CICS transaction in mainframes.

A CICS transaction is a logical unit of work initiated by a user request or a program in the CICS environment.

Example:

CICS transaction definition: EXEC CICS START TRANSID('XYZ')
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Ques 7

Explain the function of the ISPF (Interactive System Productivity Facility) in mainframes.

ISPF is a software product for interactive application development and provides a menu-driven interface on mainframes.

Example:

ISPF command: TSO ISRDDN
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Ques 8

What is the purpose of the GDG (Generation Data Group) in mainframes?

GDG is a feature in mainframes used for version control and management of sequential datasets.

Example:

GDG definition: //OUTPUT DD DSN=MY.DATA.GDG(+1),DISP=(NEW,CATLG)
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Ques 9

Explain the purpose of the IDCAMS REPRO command in mainframes.

The IDCAMS REPRO command is used to copy data from one VSAM dataset to another in mainframes.

Example:

IDCAMS REPRO command: REPRO INFILE(IN_DATASET) OUTFILE(OUT_DATASET)
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Ques 10

Explain the purpose of the JES (Job Entry Subsystem) in mainframes.

JES is a component in mainframes responsible for receiving, scheduling, and managing batch jobs.

Example:

JES command: //SYSOUT DD SYSOUT=A
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