MongoDB has been around for a while now, with the current version of production-level code at 1.4.3. Full integration to PHP is available via PECL, across platforms, or precompiled binaries. And yes, it’s Open Source.
From the site itself, MongoDB puts itself out there as a database that bridges the gap between key-value stores (which are fast and highly scalable) and traditional RDBMS systems (which provide rich queries and deep functionality), and is geared toward document-type storage. It supports Map/Reduce for proper high-speed iteration through high volumes of data, allows for easy replication and HA (high availability – but you knew that already). Who uses it? Sourceforge, bit.ly, github and the New York Times, to name a few, use MongoDB in production, as does disqus, and shutterfly. It outputs JSON-style data structures.
MongoDB (from “humongous”) is a scalable, high-performance, open source, document-oriented database. (more…)