IDUG EMEA 2026

This session will share experience from client studies and engagements: sharing proven recommended best practice; learning good, bad and ugly; providing answers ti important, frqeeunt or difficuly questions. This session will cover the following topics: Complacency about component failure and ability to absorb workload failover in a dat asharing environment; missed opportinity for elapsed time performance improvementnfor skip sequnetial batch processing; misteps in evaluating the performance benenfit of CICS-Db2 thread reuse and RELEASE(DEALLOCATE); SQL coding to avoid update anomaly when using cursor stability isolation; misadventures when using High Performance DBATs;monitoring WLM policy achievement; options for mass data recovery following logical data recovery and data loss; performance issue with remote DDF batch workload; tuning ogf GBPs; thorough Disaster Restart testingh.

Db2 upgrades can look straightforward in your favourite manual, but real-world environments often tell a different story. In this session, we share practical user experiences and lessons learned from two recent Db2 upgrade projects that we undertook – moving from Db2 v11.1 to v11.5 on Windows, and from Db2 v11.5 to v12.1.3 on Linux. These upgrades involved very different setups, including single versus multiple instances, standalone databases versus HADR clusters, and the contrasting challenges between Windows and Linux platforms. We will walk through the expected and unexpected issues we encountered, highlight pitfalls not clearly documented in the manuals, and explain the workarounds and strategies that allowed us to complete the upgrades successfully.

In the next version of Db2 for z/OS IBM is removing some deprecated functions. I will describe how to find the affected objects and functions and how to convert them. I will also touch on some pitfalls and share our experiences. Some examples are non-UTS tablespaces, but there are more. And there are some more things that is not documented yet.
The presentation will not cover the conversion from VTAM to TCPIP.

This presentation explains how DB2 uses workfiles for a range of purposes, including SORT, scrollable cursors, and temporary tables. It also describes how workfile allocation and usage behave both before and after the enhancements introduced in V13 FL508. Finally, it reviews the workfile monitoring capabilities available today, with particular emphasis on the enhancements introduced over the past decade and how they can be leveraged to identify tuning opportunities.

In this session we will demonstrate how data can be utilized to gain valuable insights into system performance and optimization. We will provide an introduction of the newest and greatest capabilities in visualizing performance data for an easy step in, which can lead to significant performance improvements.
The objective of this session is to demonstrate some real-world examples mainly out of Db2 and WLM and how visualizing performance data helped the Performance Teams diagnose performance issues, better perform capacity planning and how attendees can learn easily more about their z/OS /CICS /Db2 environment.