Glossary term
What is Connection pool? Meaning for developers
In System Design
A reusable set of open connections. Example: 20 database connections shared by all requests.
Learn it properly · System DesignLesson 5: SQL Basics Every System Designer NeedsBefore sharding, replicas or NoSQL, learn to use one relational database well. Tables and keys, the queries you will write every day, indexes and EXPLAIN, the N+1 trap, transactions, and the connection limit that takes databases down.In Backend in Depth
A fixed set of database connections that requests share and reuse. Opening a new connection costs a lot.
Learn it properly · Backend in DepthLesson 8: Prisma in Production: N+1, include, Batching and Connection PoolsHow N+1 appears in loops and GraphQL resolvers, how Prisma batches findUnique, how it loads relations, and why you share a single client.