Sequoia is a transparent middleware solution offering clustering, load balancing and failover services for any database. Sequoia is the continuation of the C-JDBC project. The database is distributed and replicated among several nodes and Sequoia balances the queries among these nodes. Sequoia handles node and network failures with transparent failover. It also provides support for hot recovery, online maintenance operations and online upgrades.
Features in a nutshell
No modification of existing applications or databases.
Operational with any database providing a JDBC driver (other APIs support through Carob and Myosotis).
High availability provided by advanced RAIDb technology.
Transparent failover and recovery capabilities.
Performance scalability with unique load balancing and query result caching features.
Integrated JMX-based administration and monitoring.
100% Java implementation allowing portability across platforms with a JRE 1.4 or greater.
Open source licensed under Apache v2 license.
References
Sequoia is the technology used by Continuent uni/cluster product line that I developped when I served as Chief Architect for Continuent. I left Continuent in 2007 but I keep working on Sequoia independently and I am currently developing the next generation of Sequoia (a.k.a Sequoia 4).
Sequoia has a wide range of production users ranging from small startups to Fortune 500 companies. I have already successfully used Sequoia with MySQL, PostgreSQL, Apache Derby (a.k.a JavaDB), HSQLDB, Sybase, Oracle, MS SQL Server and IBM DB2.
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Sequoia Description 
