Berkeley DB is a programmatic toolkit that provides fast, reliable, scalable, and mission-critical database support to software developers. It provides data management services for some of the most demanding high-end server applications in the world. Vendors of industry-leading messaging, directory, billing and provisioning servers as well as the biggest portal, ASP and commerce sites on the Internet rely on Berkeley DB. Berkeley DB's high performance and scalability support thousands of simultaneous users working on databases as large as 256 terabytes.