With the release of Sitecore 7.5 we saw the introduction of NoSQL to the Sitecore ecosystem. Sitecores platform of choice is MongoDB, an open source document database that runs as a separate server. MongoDB stores all of its data as memory mapped files in a format very similar to JSON (called BSON).
By default, Sitecore Analytics now requires both SQL Server and MongoDB to operate. MongoDB provides much of the data capture and storage and SQL Server the aggregation of that data. Additionally, the ECM and WFFM for Sitecore 7.5 now also use the xDB platform and so also use MongoDB by default.
Its worth knowing this as any implementation of Sitecore 7.5 (or an upgrade to it) will need the infrastructure to support a Mongo installation. Reading through the xDB documentation, it isn’t immediately clear what is required of an xDB infrastructure and it does require quite a bit of background reading. This first post, of a series, is intended to give you a background in some of the items you’ll need to be aware of and also how this relates to Sitecore.