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Mainframe Dev AI Interview Prep
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Module 1
COBOL Refresher and Advanced Scenarios
1
COBOL Program Structure and Data Types
Recall COBOL program structure (divisions, sections) and standard data types/PIC clauses.
2
Advanced Data Manipulation with Files, Strings, and Intrinsic Functions
Apply advanced file handling, string verbs (STRING/UNSTRING/INSPECT), and intrinsic functions.
3
Advanced Subprogram Design & Calling Conventions
Implement advanced subprogram patterns, analyzing static vs. dynamic CALL and BY REFERENCE vs. BY CONTENT trade-offs.
4
Debugging COBOL Abends: S0C7, S0C4, S322
Diagnose common COBOL abends (S0C7, S0C4, S322) from system dumps and compile listings.
5
Optimizing COBOL Performance: SEARCH ALL, OCCURS DEPENDING ON, and Table Handling
Optimize COBOL performance using SEARCH ALL, OCCURS DEPENDING ON, and efficient table handling techniques.
6
Extracting Subprograms: COBOL Refactoring
Refactor a monolithic COBOL program by extracting a section into a callable subprogram while preserving data scope.
7
Reconciling Mismatched Sequential Files
Solve a scenario: Reconcile two large sequential files with mismatched record formats and keys.
8
Processing Multi-Record-Type Files with Internal Sorting and Control Breaks
Solve a scenario: Process a multi-record-type file with internal sorting and control break logic.
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