eXtremeDB 4.0 Embedded Database
December 8, 2008[From McObject]
McObject released eXtremeDB 4.0 beta of its in-memory and on-disk embedded database system for real-time applications. New in eXtremeDB 4.0 are a fast, new native application programming interface (API) that enhances developer productivity; higher performance via improved multi-user coordination; and support for the KD-Tree, a database index vital to spatial and pattern-matching applications.
The article continues at http://www.mcobject.com/December8/2008