In an interesting twist of irony, Oracle, which is taking aim at Linux leader Red Hat for being too expensive, is being undercut with an open source challenge to its namesake database.
VoIP vendor Vonage Networks is deploying EnterpriseDB, which is built on top of the open source PostgreSQL database as an alternative to Oracle. EnterpriseDB Advanced Server adds Oracle compatibility to native PostgreSQL as well as performance improvements.
http://www.internetnews.com/dev-news/article.php/3644946