As the book's tittle expresses it involves examples, recipes, different test cases for almost all topics in the chapters. This is great, because just definitions and descriptions are not enough to fully understand the concept (especially) in a performance tuning book.
Book covers the most important performance tuning topics for an Oracle database. You'll find it useful even you're a developer or a dba. It describes the tuning methods with different aspects. Performance tuning is not like many other Oracle database topics becuse there is not a general "true" many times. A tuning method may halve the job duration in a database, where it may double the time for another database. This is the most important fact that you need to know when searching for tuning recommendations. The data type, database structure is very important in evaluating a tuning method. This book is explaining the tuning methods with almost every aspects. In which conditions we should use it or not and why. Here i want to share some highlighted parts of the topic "Index Clusters" which i think will help you see what i mean.