Jonathan Lewis has been working in the information technology industry for nearly 25 years, and has been using the Oracle relational database management system for more than 20. For the past 16 years, he has worked as a freelance consultant, often spending only one or two days at a time with any client to address critical performance problems. He also advises on design and implementation problems, and on how to make best use of the most appropriate Oracle features for a given project. Jonathan is also renowned throughout the world for his tutorials and seminars about the Oracle database engine and how to make best use of it. Having visited 42 countries at last count, his exceptional ability has earned him an O1 visa from the United States, allowing him to do consultancy and lecture work there. Jonathan has written two books about Oracle (Practical Oracle8i, Addison-Wesley, 2000; Cost-Based Oracle Fundamentals, Apress, 2005), and has contributed to two others (Oracle Insights, Apress, 2004; Oracle Database 10g New Features, Oracle Press, 2004). He also writes regularly for the UKOUG magazine, and occasionally for other publications around the world. In the limited amount of time he has leftover, Jonathan also publishes high-tech Oracle articles on his blog at jonathanlewis.wordpress.com.