VSDB is an experimental database based on atomic updates of constant databases. Unlike other lightweight databases, it supports full transactional semantics when reading and writing to the database. A VSDB database currently consists of several hash tables (with plans for other data structures). Transaction conflicts are detected and rolled back and the system maintains full ACID semantics. It may be used across distributed filesystems such as NFS without problems. The interesting this about VSDB is that it is able to do this with no locking whatsoever, not even file locks.
