• Guru: DateTime Rules Of Thumb

  May 18, 2026 Ted Holt

  I am not a great programmer. I am a decent programmer who has found ways to stay out of trouble. I use many little rules of thumb to keep me and the people I serve from being unpleasantly surprised at inopportune moments. Today I share rules of thumb regarding datetime data that have served me in my work.

  The first date field I used in an RPG program was a six-digit zoned-decimal value in MMDDYY format. This was part of a programming assignment for a class I was taking at the local vocational-technical center in days of yore. In my …

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• Guru: Load A Varying-Dimension Array With One SQL Fetch

  May 11, 2026 Ted Holt

  One thing I really like about working in different shops is the vast amount of source code I’m exposed to. But that’s not the best thing. The best thing is the people I meet and get to know. The more clients, the more teachers. Combine source code and people, and my life, personally and professionally, is enriched.

  Today I’m pleased to pass along an SQL technique I picked up from the IT shop of a manufacturer. The programmers use this technique to load subfiles from SQL cursors in RPG programs. It works in client-server applications as well. It combines a …

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• Guru: Cohesion First – What A Procedure Should Be Responsible For

  April 6, 2026 Gregory Simmons

  One of the easiest mistakes to make in procedure-driven RPG is assuming that small procedures are automatically well-designed procedures. They are not. Size and cohesion are related, but they are not the same thing. A cohesive procedure has a single, clear responsibility. It exists to answer one business question or perform one business action. When a procedure tries to do more than that, it stops being a reusable building block and starts becoming a liability.

  In procedural RPG, nothing enforces this discipline. There is no compiler warning when a procedure quietly takes on a second responsibility. There is no language …

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• Guru: IBM i Job Log Detective Brings Structure To Job Log Analysis In VS Code

  March 9, 2026 Gregory Simmons

  Remain Software has released a new Visual Studio Code extension called IBM i Job Log Detective, and it targets a pain point every IBM i developer understands: reading job logs efficiently.

  In addition to its marketplace availability, IBM i Job Log Detective is open source under the MIT license and can be found on GitHub at: https://github.com/RemainSoftware/jld

  There has never been anything wrong with IBM i job logs themselves. They are exhaustive, consistent, and remarkably detailed. When something fails, the job log contains the truth. The issue has always been consumption. Large QPJOBLOG files can run thousands of lines (or …

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• Guru: Managing The Lifecycle Of Your Service Programs – Updates Without Chaos

  February 23, 2026 Gregory Simmons

  You’ve written your service programs, organized your modules, picked your activation groups, and maybe even set up a tidy binding directory. Everything seems perfect – until someone needs to update a procedure that half the shop’s programs depend on. Suddenly, that tidy structure can feel like a trap. Welcome to the reality of service program lifecycle management.

  The key principle here is simple: change with care. Any update to a service program can ripple across every program bound to it. Without a strategy, you’ll find yourself fielding calls about broken reports, failed jobs, or, worst of all, subtle logic errors …

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• Guru: Are Binding Directories A Shortcut Or A Source Of Chaos?

  February 16, 2026 Gregory Simmons

  Ask any IBM i developer about binding directories, and you will usually get one of two reactions: A grateful nod or an eye roll. For some, binding directories are a lifesaver, making compile commands cleaner and projects easier to manage. For others, they are a ticking time bomb, introducing hidden dependencies that come back to haunt you months later.

  I have seen both sides. In fact, one of the worst compile-day disasters I’ve witnessed started with a well-meaning developer adding a single service program to a global binding directory. Suddenly, half the shop’s programs were linking against the wrong version …

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• Guru: Service Programs And Activation Groups – Design Decisions That Matter

  February 9, 2026 Gregory Simmons

  If you have been writing service programs for a while, you might treat binding like flipping a light switch: write some code, compile it, bind it, done. It works – until it doesn’t. Behind the scenes, IBM i is doing a lot more than just connecting your program to a library of procedures. And if you’re not paying attention to activation groups and how you structure your service programs, you might be setting yourself up for sluggish performance or debugging nightmares down the road.

  Let’s demystify what is really happening when you bind and why activation groups deserve more of …

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• Guru: Binder Source Is Your Service Program’s Owner’s Manual

  February 2, 2026 Gregory Simmons

  If service programs are the backbone of modular RPG development, then binder source is the owner’s manual you didn’t know you needed. It’s not glamorous, but it’s the piece that ties everything together: Controlling what you export, defining your public API, and managing change over time. Yet, far too many shops treat binder source as optional – if they use it at all. That’s a mistake.

  Let’s start with what binder source actually does. When you create a service program, you need to tell the system which procedures should be visible to callers. You could just use EXPORT(*ALL) and call …

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• Guru: Access Client Solutions 1.1.9.11 – Security First, With Continued Investment In SQL Tooling

  January 26, 2026 Gregory Simmons

  Big Blue has released IBM i Access Client Solutions (ACS) version 1.1.9.11, and while the release is anchored by an important security fix, it also reflects IBM’s continued investment in the SQL tooling that has become central to day-to-day IBM i development and administration. This is not a feature-heavy update on its own, but it arrives after a series of releases that have steadily expanded the usefulness of both Run SQL Scripts and SQL Performance Center.

  The primary driver for upgrading to ACS 1.1.9.11 is the remediation of CVE-2025-66516, an XML External Entity vulnerability related to how ACS processes certain …

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• Guru: Taming The CRTSRVPGM Command – Options That Can Save Your Sanity

  January 19, 2026 Gregory Simmons

  If you have ever run CRTSRVPGM without paying attention to its parameters, you are not alone. Many developers just accept the defaults and move on, only to discover later that those defaults can introduce subtle bugs or unnecessary headaches. The command looks simple, but it is packed with options that can either make your life easier or create a ticking time bomb in your system. Let’s talk about a couple of the most important ones.

  One parameter that deserves special attention is OPTION. By default, this parameter is blank, which seems harmless, but that blank value means you’re allowing duplicate …

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