Collecting all this information slows down your application, so you shouldn’t enable Hibernate statistics in your production environment. That makes it a lot easier to get a general overview of your application and helps you to identify the sessions you should take a closer look at.īut be careful. If you enable the Hibernate statistics component, it measures how long it takes to execute a query and summarizes the executed queries and execution times at the end of each session. The logging of all executed queries provides basic information about all database interactions, but Hibernate can do a lot more. 14:36:39,325 DEBUG SQL:92 - select order0_.id as id1_1_, order0_.version as version2_1_ from purchase_order order0_ where order0_.id=1Īctivate Hibernate Statistics for More Details When you activate this logging configuration, Hibernate will write a log message for each executed SQL statement.
SQL TO JPQL CONVERTER TOOL CODE
You can see an example of a log4j configuration in the following code snippet, and you can fork the project with this and all following code snippets on github. Hibernate uses the configured logging framework to write the messages to the log file, and you can change it at any time without changing your deployed application. The best way to activate the logging of executed SQL queries is to set the log level of the category to DEBUG. Let’s start with the logging of the executed SQL statements. With the correct logging configuration, you get all the information you’re looking for. Hibernate writes log messages telling you:Īs most frameworks and applications, Hibernate uses different categories and log levels to log this information. It’s no surprise that Hibernate Logging has all the information you need to understand how it interacts with the database. Let’s look at both options closely before showing you how you can use them to find different performance problems. That’s why I prefer Hibernate’s internal logging and Retrace. However, you should choose the tool you feel most comfortable with.Īs a Java developer, I don’t like to work with database logs, and I know that I can’t always replace the JDBC data source. You can analyze your database logs, activate Hibernate’s internal logging, use a JDBC data source that logs all executed statements or use an external tool like Retrace to monitor your system.Īll of these options can help you better understand how Hibernate interacts with the database. There are lots of different ways you can do that. The best way to avoid these Hibernate performance issues is to monitor the database interactions during development, test and production. That makes it hard to find inefficiencies and potential performance problems before they cause trouble in production. As a developer using Hibernate, you most often don’t know if or when Hibernate will execute an SQL statement for your call of a method on the EntityManager.
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