MongoDB Sharding 101: Creating a Sharded Cluster

This tutorial explains MongoDB sharding, outlining the roles of shards, config servers, and query routers (mongos), and provides a step-by-step guide to building a sharded cluster with replica sets, adding shards, enabling sharding on a database, creating an index and shard key, and verifying distribution via sh.status() and explain(). It emphasizes range-based sharding, chunk sizes, automatic splitting, and the balancer’s role in migration, concluding with examples of querying and interpreting query plans in a sharded environment.