[From McObject LLC]
The Perst all-Java open source, object-oriented database also adds multi-version concurrency control (MVCC) for fine grain locking, and simplifies index maintenance
McObject announced that the newest release of the Perst open source, object-oriented pure Java embedded database system supports integration with the widely used open source, all-Java Apache Lucene information retrieval library, to provide highly efficient text indexing and searching within Perst databases.
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http://www.mcobject.com/pressroom.php?step=3&article=86