Spring Data JPA Implementing Bulk Updates
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When using Spring Data JPA, most developers are used to letting Spring handle almost all database operations. That’s especially the case for all update operations. Thanks to JPA’s entity mappings and the managed lifecycle of all entity objects, you only need to change an attribute of an entity object. Everything else happens automatically.
But having a good, automated solution for the most common use cases doesn’t mean it’s the ideal solution for all use cases. JPA’s and Spring Data JPA’s handling of update operations is a good example of that. The default handling is great if you only need to update a few entities. Your persistence provider automatically detects changes to all managed entity objects. For each changed object, it then executes an SQL UPDATE statement. Unfortunately, this is a very inefficient approach if you need to update a huge number of entities. It often causes the execution of several dozen or even hundreds of SQL UPDATE statements.
This is a general problem when using JPA. Still, especially users of Spring Data JPA are surprised when I tell them about this and show them that even a call of the saveAll method on their repository doesn’t avoid these statements.
But there are 2 easy-to-use options to reduce or avoid the performance impact entirely.
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