Using DataLoader with Apollo Server

n+1 Problem

The N+1 Antipattern In Short

The N+1 query antipattern happens when a query is executed for every result of a previous query. The query count is N + 1, with N being the number of queries for every result of the initial query. If that initial query has one result, N+1 = 2. If it has 1000 results, N+1 = 1001 queries.¹

• dataloader can fetch from two different servers
• need to create one loader per relationship

To Review

• Performance and N+1 Queries: Explained, Spotted, and Solved
• GraphQL Server Tutorial with Apollo Server and Express
• Batching GraphQL Queries with DataLoader
• Ben Awad: GraphQL N+1 Problem
• Using Dataloader | Build a Complete App with GraphQL, Node.js, MongoDB and React.js