What is "extremedb"

eXtremeDB is a high performance, low-latency, ACID-compliant embedded database management system using an in-memory database system (IMDS) architecture and designed to be linked into C/ C++ based programs. It works on Windows, Linux, and other real-time and embedded operating systems. Building on this core IMDS, there are several editions supporting high availability, database clustering, hybrid (in-memory and disk-based) data storage, columnar layout of time series data (such as financial market data) and other specialized abilities.