IBM i Fundamentals

Organize fully free-form RPGLE with consistent sections, spacing, indentation, continuations, and comments that make program flow easier to review.

REST APIs and HTTP clients let IBM i exchange business data with modern systems while keeping the core logic controlled…

JSON and XML processing let IBM i exchange structured data with modern systems without forcing the core logic to change…

Good IBM i error handling turns a vague failure into a message, a log entry, and a clear recovery path.

Modules, bound programs, and binding directories are the packaging layer that turns compiled IBM i code into reusable application components.

Prevent IBM i resource leaks and job restarts by mastering activation groups, call stacks, ACTGRP settings, and a practical RPG,…

Good IBM i application design separates concerns, keeps business logic readable, and makes change safer for the whole team.

Security auditing and authority collection help IBM i teams see how access is used in practice and where permissions should…

Release upgrades succeed when compatibility, testing, and rollback planning are treated as first-class work.

PTF management is the routine discipline that keeps IBM i systems current, stable, and less surprising over time.

Access Client Solutions is the modern client toolkit many IBM i users rely on for sessions, SQL work, file transfer,…

The Integrated File System is how IBM i works with stream files and directories in a way that looks familiar…

Data areas, data queues, and user spaces give IBM i programs simple building blocks for sharing state and passing messages.

A practical look at why IBM i remains relevant in 2026, including stability, integrated architecture, and long-lived business value.

Output queues and spool files are the IBM i print and report pipeline, even when the final destination is not…

A practical guide to IBM i security basics, including authorities, object protection, and simple best practices.

Subsystems and job descriptions are the operational framework that decides where work runs and how jobs are classified on IBM…

Journaling and commitment control are the pieces that help IBM i applications protect data changes and recover cleanly after failures.

A practical IBM i career path starts with the basics, then grows into development, operations, database work, and broader platform…

A beginner-friendly explanation of Db2 for IBM i and why the database layer is so tightly integrated with the platform.

Good IBM i maintenance is about managing change safely: source control, review, testing, documentation, and predictable releases.

A practical introduction to CL programming on IBM i, including what it is used for and why it matters in…

SQL on IBM i is the modern way to query and manage Db2 for i data. Beginners can start with…

A beginner-friendly introduction to RPGLE on IBM i, including what it is, why it is still used, and how to…

Performance tuning on IBM i starts with measurement, workload understanding, and small changes that improve real bottlenecks.

IBM i batch work runs on schedules, queues, and jobs. Understanding that flow helps beginners see how the platform handles…

A practical introduction to the IBM i object model, including libraries, objects, members, and how they are used every day.

Debugging on IBM i starts with logs, messages, and the right tools. Beginners can learn to isolate problems without guessing.

A beginner-friendly explanation of the IBM i architecture, including the operating system, integrated database, objects, and the server layer.

IBM i organizes data through libraries, files, members, and SQL access. Understanding those layers makes the platform much easier to…

IBM i and mainframe systems both support serious enterprise workloads, but they are different platforms with different operating models, scale…

Modernizing IBM i does not mean replacing the platform. It usually means exposing existing systems through APIs, SQL, better interfaces,…

A short history of the AS/400 platform lineage and how it evolved into the IBM i environments that run on…

AS400 is the common historical name, while IBM i is the current operating system. This article explains what each term…

AS400 usually means IBM i running on IBM Power hardware. This beginner's guide explains AS/400, IBM i, and IBM Power…