Mainframe Interview Questions and Answers
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Freshers / Beginner level questions & answers
Ques 1. Explain the purpose of COBOL in mainframes.
COBOL (Common Business Oriented Language) is a high-level programming language designed for business applications on mainframes.
Example:
COBOL code: MOVE 10 TO AMOUNT.
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Ques 2. Explain the concept of partitioned datasets in mainframes.
Partitioned datasets (PDS) are file structures in mainframes that store data in separate members or partitions.
Example:
JCL for PDS: //DDNAME DD DSN=MY.PDS,DISP=SHR
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Ques 3. What is the purpose of the IEBGENER utility in mainframes?
IEBGENER is a utility used for copying or generating datasets in mainframes.
Example:
IEBGENER JCL: //SYSIN DD * GENERATE MAXCC=0 /*
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Ques 4. What is the purpose of the DD statement in JCL?
The DD (Data Definition) statement in JCL is used to define the input and output data files for a job step.
Example:
DD statement: //INPUT DD DSN=INPUT.FILE,DISP=SHR
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Ques 5. What is the purpose of the IEFBR14 utility in mainframes?
IEFBR14 is a dummy utility used for job steps that do not require any processing, mainly for job control purposes.
Example:
IEFBR14 JCL: //STEP1 EXEC PGM=IEFBR14
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