db4o is an object database for Java and
all .NET environments. Its features include ACID transactions, automatic class schema recognition, query-by-example, a S.O.D.A. object querying API, native queries, LINQ support on .NET, callback methods, memory files, cascade-on-delete, multi-threaded access, and Java Webstart and servlet support.
Project Release infomations and Project Resources. Note that these informations are from this projects Freecode.com page and the downloads themselves may not be hosted with SourceForge.JP.
This release comes with new monitoring support to collect runtime statistics about performance relevant behavior and state. Statistics are published through the Performance Counters API. You can now use the PerfMon monitoring tool to view graphed information about queries, the free space manager, the object reference system, IO, and networking. Since this is still a work in progress, you may expect to see changes in the API and the list of actual statistics supported.