This is an excellent book with an encyclopedia-like approach to Oracle performance tuning, concentrated around the optimizer. It doesn’t cover architectural changes in the database in the newer releases, like the new redo mechanism with the private strands or the new implementation of the latches and pins. In my opinion, Oracle performance is more than just the optimizer.
Also, the book is very long and without the sections for new features in 12c, which makes it rather hard to read for those interested primarily in the new features of 12c. It is also very useful as an encyclopedia, but very hard to read from cover to cover, which is what I did.
Having said that, it is also the most complete description of the Oracle optimizer available. An alternative title could be “all about the Oracle optimizer in one place”. The book is very useful and a must have for any Oracle DBA interested in performance.
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