Db4Object has released version 6.0 of their open source object database. The product allows data to be stored at the object level instead of in a relational format. Compatibility with relational databases can be achieved using the db4o replication system. Native support is provided for both Java and .NET environments. Among the enhancements in this release:
- Better performance and less memory consumption than v5.x
- Lazy queries, a new server-side cursor technology to boost client-server performance
- .NET API changes make db4o as native to .NET as it is to Java
- Documentation "2.0", WIKI-based reference documentation infrastructure
- Fast defragmentation makes it now faster to defrag your database files
- ObjectManager v6.0, a complete rewrite addressing many user requests
- db4o Replication System (dRS) v6.0 now supports delete object replication as well as better compatibility to more databases
The other major change with this release is broader open source licensing. Db40o comes in both a GPL and commerical version (similar to mySQL). Licensing has been changed for the open source version to allow compatibility with projects licensed under Apache, LGPL, BSD, EPL, and others.
Community comments
Java object databases
by David Moshal,
SQL?
by Sam Smoot,
Java object databases
by David Moshal,
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I wonder how it compares to the excellent ObjectDb database?
SQL?
by Sam Smoot,
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Was the SQL query interface ever released? I thought I remembered hearing around the 4.x time-frame that the 5.0 release would include it. This so that a db4o server could be used as a source for an OLAP database.