"MySQL 5.5 remains and future versions will remain, open source under the GPL license," Tomas Ulan, vice president of engineering for MySQL at Oracle said.
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darthcamaro writes: Two years after Sun released MySQL 5.1, Oracle has picked up the ball with the official release of MySQL 5.5. New features include semi-synchronous replication, InnoDB by default and new SIGNAL/RESIGNAL support for exception handling. Above all, Oracle stressed that they are comitted to further MySQL open source development and that they see it as a complentary technology to their proprietary Oracle database.