MongoDB 3.0.6 recently released, is an open-source, document-oriented database designed for ease of development and scaling. Think of MySQL but with JSON-like objects comprising the data model, rather than RDBMS tables. Significantly, MongoDB supports neither joins nor transactions. 3.1.7 is a development release and is not intended for production use. The 3.1 series will evolve into 3.2, which will be for production. MongoDB 3.0.6 Major Changes Improvements to WiredTiger Stability SERVER-19751, SERVER-19673, and SERVER-19573.