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Cost-Based Oracle Fundamentals (Expert's Voice in Oracle) Paperback – October 31, 2005
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Top Customer Reviews
This book is, well, in a word amazing. If you have ever been baffled or bemused by why the heck did the optimizer do that, or as Jonathan wrote on page 299:
"I am reluctant to call something a bug unless I can work out what Oracle is doing and can prove that its doing something irrational. Too many people say, Its a bug when they really mean I dont know why this happened."
You will absolutely love this book. In it you will discover the hows and whys of the optimizer. Why statistics matter, how they matter. Whats up with histograms when and where do we need them, what affect do they have.
Sprinkled throughout the book are random insights like this one:
"There are many ways to implement Oracle systems badly, and as a general rule, anything that hides useful information from the optimizer is a bad idea. One of the simple, and highly popular, strategies for doing this is to stick all of your reference data into a single table with a type column. The results can be catastrophic as far as the optimizer is concerned."
And then is goes on to say why. That is what I really really like it goes on to say why. I hate it when statements are made and no reasoning is made why. You will find none of that in this book.
Jonathan did one thing in this book that Ill definitely be stealing myself. One neat thing is every chapter ends with a list of script names and descriptions. In the text, he references these script names as well. That way, when you download the code you have a straight reference to the sample you should be running. Ive used the (extremely poor) naming convention of demo001.sql, demo002.sql and so on. Next book theyll all have names and Ill be referencing exactly like he did. Very nice.Read more ›
Compared to SQL optimizations all the other issues that DBA deals today look ridiculous. There is no reason why, for example export and import should be more complex than copying image file from your camera. Likewise, managing extents and segments is totally automated these days. All the manageability trend just proves a simple idea that RDBMS is nothing more than query execution engine.
Now, unlike any other RDBMS implementation area, the flow of poorly executed SQL never seems to cease. SQL Optimization is well known to be a difficult problem. Statistics information is incomplete, robust cost metrics is elusive, and the search space is explosive. The optimization goals are often conflicting. The very first idea that every SQL performance analyst discovers: "The optimization is only as good as its cost estimates". Those issues are fundamental rather than SQL DBMS vendor specific, of course. Given the scope and complexity of the problem, one citation comes to mind: "There is no emperor's way to SQL optimization".
Another interesting thing is how this book illustrates, though
accidentally, the challenges of proprietary software systems. Much of this book and the authors time is spent reverse engineering the CBO, Oracle's bread and butter optimizing engine. Source code, and details about its inner workings are not published or available. And of course that's intentional. But what's clear page after page in this book is that for the DBA and system tuner, going about their day to day tasks, they really need inside information about what the optimizer is doing, and so this book goes on a long journal to illuminate much of what the CBO is doing, or in some cases provide very educated guesses and some speculation. In contrast, as we know and hear about often, the Open Source alternative provides free access to source code, though not necessarily to the goods themselves. What this means in a very real way is that a book like this would not need to be written for an alternative open source application, because the internal code would be a proverbial open book.Read more ›
Most Recent Customer Reviews
This is a good book with great material and in depth coverage of oracle database. However, the material is tough to digest because it is highly condensed and cryptic in most of... Read morePublished 17 months ago by Carlos
Excellent book ! Covers how the optimizer works, what quirks you need to know. Beware that the optimizer isn't omniscient !Published on July 14, 2014 by Hemant K Chitale
It was back in late 2005 or early 2006 when I was prompted by an Oracle magazine issue to buy the then best Oracle seller book of the year: Oracle Cost Based Fundamentals. Read morePublished on November 9, 2013 by Mohamed Houri
Do NOT read this book at night when you're tired. It will put you to sleep immediately. You have to concentrate on this stuff and pay attention, but if you spend the time to really... Read morePublished on September 14, 2013 by Lg
WOW!!! If you are really keen to know how the optimizer works, how cost is computed, how hash join, nested loop join, query transformation happens, multi table join etc.. Read morePublished on September 15, 2011 by sssdrout
Highly recommend this book for Oracle DBAs and Developers alike. It gives you helpful insights into the cost-based optimizer and how it creates plans for SQL it executes. Read morePublished on March 21, 2011 by Joe