javahibernatejpa

How to detect N+1 problems in a Hibernate/JPA application


Given that N+1 has been the most pernicious problem with Hibernate/JPA applications for about 20 years, I was hoping there's a way of detecting it (before it's too late). Something like the following:

I'm not sure how exactly this mythical N+1 detector would work, but if you could proxy the database queries and notice that the same query is being executed multiple times in quick succession, then that's a likely case of N+1.

However, I haven't actually found anything like this, does it exist? Is there any automated, or semi-automated way to detecting N+1?

I'm not sure how relevant this is, but in my specific case I'm using Spring Boot 3.X with Spring Data JPA.


Solution

  • If you are looking for automatised tools for detect N+1 then with Digma, you can easily detect such queries even when working with complex codebases.

    If you are looking for more details I highly recommend to you got through this article. https://digma.ai/n1-query-problem-and-how-to-detect-it/

    hat an N+1 Select query looks like in a trace Sucpected N+1