How to optimize JPQL and Criteria API query plans with Hibernate Statistics
Introduction Every entity query, be it JPQL or Criteria API, needs to be parsed and compiled to an AST (Abstract Syntax Tree) in order to generate the associated SQL query. The entity query compilation takes time, as explained in this article so Hibernate provides a QueryPlanCache to store already-compiled plans. Starting with Hibernate 5.4, the Hibernate Statistics mechanism allows you to monitor the Query Plan Cache and this article will show you how to take advantage of this feature to speed up IN query performance. For an introduction about the Hibernate Statistics… Read More
How to improve statement caching efficiency with IN clause parameter padding
Introduction Recently, I stumbled on the following Twitter thread: This jOOQ feature is indeed really useful since it reduces the number of SQL statements that have to be generated when varying the IN clause parameters dynamically. Starting with Hibernate ORM 5.2.18, it’s now possible to use IN clause parameter padding so that you can improve SQL Statement Caching efficiency. In this article, I’m going to explain how this new mechanism works and why you should definitely consider it when using a relational database system that supports Execution Plan caching.
