Solving the N+1 problem
The N+1 problem is not new to Java developers. You might have encountered this problem in hibernation, which occurs if you don't optimize your queries or write entities properly.
Let's understand what the N+1 problem is.
Understanding the N+1 problem
The N+1 problem normally occurs when associations are involved. There are one-to-many relationships between the customer and the order. One customer can have many orders. If you need to find all the customers and their orders, you may do the following:
- Find all the users.
- Find all the user's orders based on the user's ID, which was received in the first step by setting the relation.
So, here, you fire two queries. If you optimize the implementation any further, you can place a joint between these two entities and receive all the records in a single query.
If this is so simple, then why does GraphQL encounter the N+1 problem? You need to understand the resolver function...