Coming Soon: Reference cards on administration, replication and sharding, and more.
Commands are special MongoDB operations that are executed by running a query against the $cmd collection. Most drivers provide a helper for running commands. Some commands are admin-only, and must be run on the admin database.
One-page guide to MongoDB queries and what they match. Also includes a list of update modifiers (e.g. $inc, $set, $push, etc.).
Quick reference for index creation and administration, with useful tips. Refer to the indexes documentation for more details.
Quick reference for replica set creation and administration. Please review the replica sets documentation for more details.