Mainframe Interview Questions and Answers
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Experienced / Expert level questions & answers
Ques 1. Explain the function of CICS (Customer Information Control System) in mainframes.
CICS is a transaction processing system that provides services for running applications concurrently on mainframes.
Example:
CICS command: EXEC CICS READ FILE(...)
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Ques 2. Explain the concept of a mainframe 'region'.
A mainframe region is a logical partition where programs and data are executed and managed independently.
Example:
region definition in JCL: //REGION1 EXEC PGM=PROGRAM1,REGION=4M
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Ques 3. Explain the concept of a REXX (Restructured Extended Executor) in mainframes.
REXX is a programming language used for scripting and automation in the mainframe environment.
Example:
REXX script: ADDRESS TSO 'SUBMIT JOBNAME'
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Ques 4. What is the purpose of the IGGCSI00 utility in mainframes?
IGGCSI00 is a utility used for defining and managing the system catalog in a DB2 environment on mainframes.
Example:
IGGCSI00 JCL: //SYSIN DD * RUN PROGRAM(DSNTIAUL) PLAN(DSNTIUL1) ...
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Ques 5. What is the function of the SYNCSORT utility in mainframes?
SYNCSORT is a utility used for sorting, merging, and copying datasets similar to DFSORT in mainframes.
Example:
SYNCSORT JCL: //SORTSTEP EXEC PGM=SYNCSORT ...
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