The Little Redis Book

A quick, well-loved introduction to MongoDB. In about 60 pages you learn selectors, updates, data modeling without joins, aggregation, indexes, replication, and when MongoDB is the right choice.

Karl Seguin

Practical MongoDB notes with examples: CRUD operations, the aggregation pipeline, indexes, replication, backups, bulk operations, and drivers for Java and Python.

GoalKicker

A thorough survey of the NoSQL movement. It explains consistency models, partitioning, and storage layouts, then studies key-value stores, document databases like CouchDB and MongoDB, and column stores such as Cassandra.

Christof Strauch