Be ready to explain common error codes, such as VSAM Status 23 (Record not found) or DB2 SQLCODE -811 (More than one row retrieved).
Negative value: Database error (e.g., -803 for duplicate key error, -911 for timeout/deadlock). Cursor Management for Multi-Row Processing mainframe refresher by muthu pdf link
Common Business-Oriented Language (COBOL) processes the vast majority of business transactions worldwide. Its English-like syntax makes it highly readable and exceptionally efficient for file-handling and decimal arithmetic. Structure of a COBOL Program Be ready to explain common error codes, such
Mainframes excel at concurrent processing due to specialized subsystems designed to manage transactional workloads and relational data. DB2 Relational Database Management -803 for duplicate key error