Dwight Merriman (CEO and founder 10gen) interviewed by InternetNews.com:
Basically every large enterprise in the world has those two buckets for sure—a relational database used for OLTP and some form of data warehouse and a business reporting and intelligence database—and what we’re seeing are enterprises adding a third bucket, which is a NoSQL database. So on a forward basis, enterprises will have three classes of databases instead of two.
The challenge for NoSQL database producers is to convince people that maintaining 3 types of databases would deliver better value to the business. The challenge for system architects is to figure out where each of these databases fit and are providing increased value over alternatives.
Original title and link: Enterprises Will Have Three Classes of Databases ( ©myNoSQL)