Jonathan Lewis is a freelance consultant with more than 18 years experience in using the Oracle database engine. He specializes in design, trouble-shooting, and advanced training in best use of the engine. Jonathan is a frequent speaker on the international circuit, with presentations lasting from 45 minutes to 3 days. His first book "Practical Oracle 8i" is still worth reading, despite being two generations behind the latest version, and his most recent book "Cost Based Oracle Fundamentals" is currently receiving enthusiastic reviews. Jonathan is currently a director of the UK Oracle User Group.