7N Mainframe Developer Interview Questions and Answers

What is subsrcipt and index , When will use subscript n index

Coding for condition parameters

Q1. Sort condition, null indicator, curser,db2 errors,
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Q1. Interview: Self Introduction, overflow of project, role, catlg proc instream proc difference, Gdg and syntax to create Gdg, parameters of Gdg, Restart parameter, condition parameters, Ibm utilities, to re...read more
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Q1. Basic questions
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Q2. Comp and conp3 difference
Ans. 
comp and comp3 are different data types in Mainframe, with comp3 being a packed decimal format.
• comp is a binary data type, while comp3 is a packed decimal data type

• comp uses one byte for each digit, while comp3 uses half a byte for each digit

• comp3 is more space-efficient but requires additional processing for arithmetic operations
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Q1. Senario based questions
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Q1. Person and package details
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Q1. Sort condition, null indicator, curser,db2 errors,
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Q1. Redefine clause of COBOL
Ans. 
Redefine clause in COBOL allows a data item to be referenced by different names and formats.
• Redefine clause is used to save memory space by sharing the same memory location for different data items.

• It is used to define a new data item that shares the same storage area as an existing data item.

• The new data item can have a different data type, length, or picture clause than the original data item.

• Example: 01 EMPLOYEE-DET...read more
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This round seems to be bit difficult..but manageable

This test is very easy if you are good at maths and reasoning