The db4o project has announced the release of version 6. "In comparison to Version 5, in-process transactions with db4o now run up to 10x faster (e.g., on Commits of added objects), while memory consumption is now constant at 3MB in all but one Pole Position benchmark test cases, reduced from up to 27MB in Version 5. Version 6 also comes with updates of two powerful components: the db4o Replication System (dRS) v6.0, to ensure compatibility to backend relational databases like Oracle and MySQL, and the new ObjectManager v6.0, which helps developers browse and debug db4o databases in an object-oriented manner. "