Mainframe
Mainframe covers COBOL, JCL, CICS, DB2, IMS DB, and VSAM — the backbone of enterprise computing for banking, airlines, and government systems.
Tutorials
| Tutorial | Description |
|---|---|
| Mainframe Explained — Complete Beginner's Guide | What mainframes are, why they still matter, and how they power global infrastructure |
| COBOL Explained — Beginner's Guide | Learn COBOL programming with DIVISIONs, file handling, and real-world examples |
| JCL Explained — Beginner's Guide | Job Control Language for submitting batch jobs on IBM z/OS |
| CICS Transaction Processing — COBOL Programs, BMS Maps, Pseudo-Conversational Programming | CICS regions, EXEC CICS commands, BMS mapsets, TDQ/TSQ queues, pseudo-conversational programming with COMMAREA |
| DB2 for z/OS — Tablespaces, Indexes, Buffer Pools, Stored Procedures & Query Optimization | Tablespaces (simple, segmented, partitioned), indexes (clustering, non-clustering), buffer pools, BIND/REBIND, IRLM deadlock detection, EXPLAIN |
Pages in this section
Mainframe Explained — Complete Beginner's Guide
Learn what a mainframe is, how IBM z/OS powers banking and airline transactions, and why mainframes still handle 70% of global business data.
✓ LiveCOBOL Programming: Beginner's Guide for Modern Developers
Learn COBOL programming: ID/ENVIRONMENT/DATA/PROCEDURE DIVISIONs, data types, arithmetic operations, file handling, and compiling with GnuCOBOL.
✓ LiveJCL (Job Control Language): Complete Beginner's Guide
Learn JCL basics: JOB, EXEC, and DD statements, dataset management, procedures, condition codes, and utilities like IEBGENER and SORT for IBM mainframe batch processing.
✓ LiveCICS Transaction Processing — COBOL Programs, BMS Maps, Pseudo-Conversational Programming
Learn CICS transaction processing: CICS regions, COBOL programs, BMS mapsets, TD queues, temporary storage queues, file control, EXEC CICS commands, pseudo-conversational programming with COMMAREA.
✓ LiveDB2 for z/OS — Tablespaces, Indexes, Buffer Pools, Stored Procedures & Query Optimization
Learn DB2 for z/OS: DDL, DML, DCL, tablespace types (simple, segmented, partitioned), indexes (clustering, non-clustering, partition), buffer pools (VPAR, Hiperpool), stored procedures, plan/package management (BIND, REBIND), deadlock detection (IRLM), EXPLAIN for query optimization, and DB2I.
✓ Live