• Guru: Deterministic Application Development With AI

  July 27, 2026 Dan Darnell and Eric Whitcomb

  Perhaps the key feature of AI is the way answers are obtained by virtue of a conversation with the AI. Contrast this with using a search engine where each “ask” is an independent request with a response.

  An AI conversation has context while search engine interactions do not. More and more, we use AI to create applications through the contextual, iterative, conversational process. As we have ideas we add these to the conversation and our application changes accordingly. Our customers are getting in on the action too. They are providing us with AI generated prototypes for new software or new …

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• Guru: Analyzing User Session Statistics, Part 1

  July 20, 2026 Mike Larsen

  I wanted to report on user activity on our IBM i. Knowing that there is a wealth of SQL table functions available to me, I knew it wouldn’t be hard to find something that would help me. For this report, I wanted to see how many times a user logged into the system during a certain timeframe.

  The table function I used is QSYS2.HISTORY_LOG_INFO. I’ll show the code I built, followed by a breakdown of what is does.

  Here is the SQL statement to determine the number of times a user signed in:

  SELECT COUNT(DISTINCT DATE(MESSAGE_TIMESTAMP)) AS DAYS_LOGGED_IN
  FROM 

  …

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• Guru: Finding Data In The Forest – Exploring Three-Part Naming In SQL

  June 22, 2026 Gregory Simmons

  Anyone who has spent time foraging for mushrooms knows that location matters. A chanterelle found in the Pacific Northwest is not the same as one discovered in the hardwood forests of the Midwest. Experienced foragers do not simply note what they found. They record exactly where they found it: the region, the forest, and the specific location. Context matters.

  The same is true in SQL. Most IBM i developers are comfortable with two-part naming. A reference like MUSHLIB.FORAGE_LOG identifies both the schema and the object. It tells SQL where to look within a single system, much like noting the forest …

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• Guru: Single Threading A Program Execution

  June 15, 2026 Chris Ringer

  A paceline in cycling is a formation where all the cyclists ride in a single file line and the lead bike is pulling the group along as everyone else is drafting behind. Eventually the lead bike will drift to the side and to the back of the line, and the next bike will take the lead for the group.

  If a spirited cyclist leaves the paceline and goes alone, all the aerodynamic benefits of drafting are lost.

  

  Likewise, at my organization, we have a CL job that is submitted hourly throughout the day every day. Normally the submitted job completes …

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• Guru: Where’s The Table?

  June 8, 2026 Ted Holt

  It began with an irritation. I considered it a simple request. “Which file did my SQL query read?” I was using the Run SQL Scripts tool to modify an SQL query with unqualified table names. And yet I knew of no ready way to determine the schema (library) name of any of the files. How was I to know which tables I had just queried?

  Let me back up a bit. My SQL client of choice is the Run SQL Scripts tool, which is part of IBM’s Access Client Solutions (ACS). It is not unusual for me to copy and …

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• Guru: SQL Sequences In RPG Let Db2 Handle The Counting

  June 1, 2026 Gregory Simmons

  There is something deeply satisfying about letting the database do the counting for you. In a world where we have spent decades hand-rolling identifiers, guarding them with locks, and hoping no job collides with another, SQL sequences feel like discovering a patch of mushrooms that quietly regenerate overnight. You stop worrying about scarcity and start focusing on what matters.

  In a procedure driven RPG system, this is exactly the kind of responsibility we want to isolate. Generating a new identifier is not business logic. It is not validation. It is not formatting. It is a single, well-defined action that deserves …

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• 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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