Keeping in-memory data consistent across multiple LPARs introduces coordination challenges. This design separates local reads from Sysplex-wide updates, using native z/OS services to synchronize changes. Synchronizing In-Memory Data Across a Parallel Sysplex Parallel...
IBM Bob can uncover access patterns and support new mainframer learning. Here’s why every tuning recommendation still needs a reality check. No, this is not the thousandth article about how IBM Bob can convert code from one language to another. What interests me much...
Mainframe performance tuning does not always require a bigger budget, and lower resource consumption does not always produce a smaller bill. The real opportunity for optimizing mainframe business value lies in understanding where tuning creates usable capacity,...
Modernization can deliver tremendous business value. But cost savings only materialize when organizations understand how mainframe economics really work. Organizations often launch mainframe modernization initiatives with a clear objective: reduce costs by moving...
What happens when an IMS logger fills up in production? How do you prepare for z/OS 3.2? Is Coupling Facility encryption worth the effort? And what does AI really mean for the future of the mainframe workforce? The latest issue of Cheryl Watson’s Tuning Letter tackles...
This article offers a practical USS tuning primer for new mainframers, developers moving into z/OS UNIX, and technical leaders who need to understand the basics before changing system settings.z/OS UNIX tuning can feel familiar and unfamiliar at the same time. USS...
IBM has an undocumented fix to the CICS WEB interface that can optimize throughput and response time while also saving CPU. This article explains how to make it work for you. In the course of my current project, I had the pleasure of working with Ole Olsen at JN Data...
The Latest Tuning Letter issue is out now! Subscribers to Cheryl Watson’s Tuning Letter will find the newest issue, 2026 No.1, on our Tuning Letter website. If you are not a current subscriber yet, sign up today! This subscription-only resource is available to both...
If you run on IBM Z, you may still stop CICS overnight so batch jobs can update VSAM files. That pause might be necessary today, but it is no longer a requirement. We will show you how to remove the trade-off between fresh data and uninterrupted access with VSAM...
In this session of the Mainframe Virtual User Groups, Broadcom Distinguished Engineer Chris Crone provided a practical walkthrough of SQL and SQL PL enhancements across Db2 12 and Db2 13. Drawing on 35 years of experience working in Db2 internals, including SQL...
