IDUG EMEA 2026

SQL is a very powerful language and can get complex. There are many ways of writing semantically equivalent queries.SQL SQL may be written by database users or ncluding external tools and these may not always be the most suitable for the Db2 engine for performance as written. The Query Rewrite component in Db2 helps towards simplifying this task for the user or external toolThe Query Rewrite (one of two optimizer components, the other being the Plan Optimizer) automatically rewrites queries within Db2 towards a better performing version for the Plan Optimizer and the Db2 execution engine.
This session delves into how AI is used to help the Query Rewrite component make better decisions. We present the challenges involved, how we tackle these challenges and touch on our next steps to transform the Query Rewrite component to exploit AI to make it even more powerful than it currently is.