In this book, volume 1 in a series of three, Jonathan covers the fundamentals: the things that everyone who uses the Oracle database needs to know about the CBO. It sheds light on the decisions the CBO makes when parsing a SQL statement and choosing an access plan. It demonstrates how the CBO calculates the cost of a plan and the rules and factors that go into these calculations. It reveals the basic assumptions the optimizer makes about the SQL and the data, explains why things go wrong and how you can fix them when those assumptions are incomplete, inaccurate, or simply false. He also includes a fabulous Upgrade Headaches section that is essential reading for anyone who has ever has, or ever will, upgrade between Oracle versions. Volumes 2 and 3 will track changes to the CBO in subsequent Oracle 10g releases, and will cover the more advanced and complex features of optimization.

Autorentext
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.

Klappentext

Jonathan Lewis is one of the world's foremost authorities in this field (he is frequently quoted and reference by other leading experts, such as Tom Kyte - see for example http://asktom.oracle.com/pls/ask/download_file?p_file=3067171813508366601

Book will be strongly co-promoted with Tom Kyte's Expert Oracle Database Architecture (1-59059-530-0)

Highlights traps for those migrating from Oracle 8i to 9i to 10g, potentially averting often disastrous performance issues and downtime (=lost revenue)

The first comprehensive book written to investigate, describe, and demonstrate the methods used by the Cost Based Optimizer

Jonathan is one of very few Oracle authors to maintain online enhancements, errata and addenda pages, so the reader will be supported long after the book is published

Inhalt
What Do You Mean by Cost?.- Tablescans.- Single Table Selectivity.- Simple B-tree Access.- The Clustering Factor.- Selectivity Issues.- Histograms.- Bitmap Indexes.- Query Transformation.- Join Cardinality.- Nested Loops.- Hash Joins.- Sorting and Merge Joins.- The 10053 Trace File.