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Cost-Based Oracle Fundamentals (Expert's Voice in Oracle) Paperback – January 24, 2007
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About the Author
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.
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Even after working with CBO trace so long, I am still learning a lot from this master. Mr. Lewis combats each component of CBO separately in a chapter format and provides examples & test cases for each of his observation and working principles. He anlyzes the results logically providing valuable insights. Every statement he makes is verifiable using the test case he provides or metalink note is referenced and no myth producing elements in his statements.
Resolving the root cause solves the problem once for all. Understanding the optimizer internals is very important to resolve the root cause of a SQL performance problem. [You can add a hint and resolve the problem, but that is usually a band-aid, not a solution to the problem]. There is no other book that deals with the root cause analysis of CBO comparable to this book.
He goes further explaining the reasoning behind the optimizer decisions. While reading the book, I had a few flashbacks such as ' Aha, that's why that query didn't work before rewriting it! I wish I read this book earlier and could have solved without a time-consuming rewrite'.
Every DBAs / performance tuners should read this book and hold on to it.
Kudos to Mr. Lewis! Looking forward for more books!!
Within the book, Jonathan provides insights into how the CBO *should* work. He follows up often by demonstrating the maturing (or devolving as the case may be) of the CBO from version to version. Beyond his own experimentation and results, he leads the reader into the process that he has followed to come to understand the internals of the CBO, providing a road map allowing the reader to continue to explore the optimizer in future releases.
However, I must take Jonathan to task, for he is a nasty tease. This book was released about two years ago. In it, he leads us on with promises of forthcoming volumes 2 and 3, dangling the carrot out there for us to follow. Sadly, these volumes are yet to be seen. Jonathan! Quit running to and fro filling our heads with knowledge at various conferences and write those books man!
A caution for the new DBA or the cursory SQL developer, you may find this book overwhelming at first glance. For the new or even intermediate DBA, it might be hard to derive practical application of what Jonathan is teaching at first glance. Take your time with the material and the insight that you will gain will be invaluable.
Overall, if you want a book with meat, then this is the book for you. It will expand your mind and the way you look at the Oracle CBO.