MongoDB Document Database AI Skill Guide

Overview & Engine Architecture

MongoDB stores BSON documents in collections. Query paths drive compound index design; the aggregation pipeline is a staged computation graph. Replica sets provide durability via oplog replication; write concern and read concern define what “acknowledged” means—agents often treat majority as free insurance without counting voting data-bearing nodes.

Drivers (TLS, authSource, replicaSet)
    -> mongod replica set / sharded cluster
        -> collections + indexes (B-tree, partial, TTL, text)
        -> oplog -> secondary apply (async)
        -> change streams (resume tokens)

When to use / when not to

Use when