This is the best ever oracle book I have read. What was interesting for me the way the test scripts where written down isolating each and every aspects that make up complex task of building the execution plan. I am no DBA but as a developer hard pressed to deliver reports that needs to be running at reasonable time (sometimes ridiculously quick) this book has been a boon for me. My understanding of oracle has gone leaps and bonds. Thanks Jonathan I have recommended this to all my colleagues.