Mainframe Programmer Interview Questions and Answers

Mainframes are large computers used for critical applications. JCL is a scripting language used to control mainframe operations.

• Mainframes are known for their reliability, security, and scalability.

• They are used in industries such as banking, healthcare, and government.

• JCL stands for Job Control Language and is used to define and execute mainframe jobs.

• JCL statements include job control statements, data definition statements, and utility statements.

• Examples of JCL commands in...read more

Main topic in mainframes is processing large amounts of data with high reliability and security.

• Data processing and storage

• Batch processing

• Transaction processing

• Security and reliability

• COBOL programming language

• JCL (Job Control Language)

• VSAM (Virtual Storage Access Method)

• CICS (Customer Information Control System)

• DB2 (Database Management System)

• IMS (Information Management System)

COBOL is a programming language used for business applications. COMP is a COBOL data type for storing numbers.

• COBOL stands for Common Business Oriented Language

• It was developed in the late 1950s and early 1960s

• COBOL is used for developing business applications such as banking, insurance, and finance

• COMP is a COBOL data type used for storing numbers in binary format

• COMP can be further classified into COMP-3, which is used for storing packed decimal numbers

VSAM stands for Virtual Storage Access Method and is a file management system used in mainframe computers.

• VSAM is used to organize and access data stored on disk in a mainframe environment.

• It supports both sequential and random access to data.

• Non-VSAM refers to file systems that do not use VSAM, such as flat files or relational databases.

• VSAM provides features like record-level locking, high performance, and efficient use of storage space.

• Examples of VSAM datasets include KSD...read more

To start a program, you need to compile the source code and then execute the compiled code.

• Write the program code in a text editor or an IDE

• Save the code with the appropriate file extension

• Compile the code using a compiler or an interpreter

• Execute the compiled code

• Debug the program if necessary

IBM Full Form in COBOL

• IBM stands for International Business Machines

• COBOL stands for Common Business Oriented Language

• IBM is a company that produces hardware and software, including mainframes

• COBOL is a programming language commonly used for business applications

• IBM mainframes are often used for running COBOL programs