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Mainframe Interview Questions & Answers

Below we have listed all the Mainframe Interview Questions and answers. Feel free to comment on any Mainframe Interview Questions or answer by the comment feature available on the page.

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Mainframe Interview Questions & Answers

A mainframe (also known as "big iron") is a high-performance computer used for large-scale computing purposes that require greater availability and security than a smaller-scale machine can offer. The term originally referred to the large cabinets called "main frames" that housed the central processing unit and main memory of early computers. Later, the term was used to distinguish high-end commercial machines from less powerful units. Most large-scale computer system architectures were established in the 1960s, but continue to evolve.

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CICS Interview Questions & Answers (406)

COBOL Interview Questions & Answers (197)

DB2 Interview Questions & Answers (332)

IDMS Interview Questions & Answers (43)

IMS Interview Questions & Answers (45)

JCL Interview Questions & Answers (189)

VSAM Interview Questions & Answers (40)


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What is difference between oracle and sqlserver ?
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What are different types of process in jcl?
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What is meant by impact analysis?
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what is the diff between dbrm.lib and loadlib what r they used for
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Where and how to use JCL process(premap and response map)?
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What datasets are archived from disk and how long are they kept?
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How do I know which archived data sets are about to expire?
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What is IAM (Innovation Access Method) and why is it better than VSAM?
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Is it a Mainframe Systems problem or a Network Systems problem?
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What will the PDS utility do for TSO?
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what is the maximum no of characterts that can be passed thru PARM in jcl?
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why do we use S9(4) comp to define the PARM length and not s9(4)comp-3? which is better?
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how can we read the last 1000 records of a file using some sort utility?
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Suppose there are 5000 records in a flat file. How can we read files 2000 to 3000 using sort?
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REDEFINE uses the same storage area. What about RENAMES? A variable that renames a group of other variables occupies different storage or same??
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I have a table with 50 records and if i try to access 100th record what will be the result.?(cobol-db2 program)
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