Based on most discussions online and at conferences, there seem to be 2 kinds of projects that use Hibernate for their persistence layer: So, what’s the difference between these projects? Are the projects in the 2nd group more complex or have higher performance requirements? No, based on my consulting projects, that’s not the case. On…
The Java Persistence Query Language (JPQL) is the most common way to query data from a database with JPA. It enables you to reuse your mapping definitions and is easier to use than SQL. But it supports only a small subset of the SQL standard, and it also provides no support for database-specific features. So…
By default, Hibernate loads all entity objects in read-write mode. It performs dirty checks to detect changes it needs to persist in your database for each of them. That makes entities very easy to use, but it also creates an overhead if you don’t want to change anything. You can avoid this by setting Hibernate’s…
Hibernate’s Query Plan Cache speeds up the preparation of your queries. That reduces their overall execution time, and improves the performance of your application. In the test scenario of this article, it improved the performance of the query preparation by up to 500%. To make it even better, Hibernate does all of that automatically. The…
One of the common questions when analyzing a slow application is if there are any slow database queries. You can, of course, monitor these queries on your database. But then you still need to match them with a part of your Java code. And because there is no easy way to see what happened immediately…
