Cost-Based Oracle Fundamentals doc

[...]... could debug 40-year-old COBOL?) I had had enough exposure to Oracle 9i to make it worth writing a new book Of course, in those four years there had been several upgrades to Oracle 8i (finishing at 8.1.7.4), two major releases of Oracle 9i, and, as I started writing, Oracle 10g was launched at Oracle World I was about ready to write Practical Oracle 9i—just too late In fact, just as I finished writing... those who post on the comp.databases .oracle newsgroups, those who post on the Oracle- L mailing list, and those who post on Oracle Corporation’s MetaLink forums And, of course, there are the members of the Oak Table Network who can be relied upon to provide entertaining and stimulating discussions I would also like to mention the audiences who attend my seminar Optimizing Oracle: Performance by Design At... answer to the second part of the question depends on your version of Oracle If you are still running 8i, then Oracle will aggregate the view and then perform the join—without considering the alternative If you are running 9i, Oracle will open up the view, join, and then aggregate—without considering the alternative If you are running 10g, Oracle will work out the cost of both alternatives separately, and... Thursday, October 6, 2005 5:36 AM Introduction W hen I wrote Practical Oracle 8i, I said in the foreword that “if you write a technical book about Oracle, then it will be out of date by the time you’ve finished writing it.” Addison-Wesley published the book about the same time that Larry Ellison announced the official release of Oracle 9i Three weeks after publication, I got the first e-mail message... years using Oracle 9i before I thought I could put some useful new information into a book, and (c) it would still be just the same book with a few small changes So there I was: I started writing in September 2003 (yes really, 2003; it took me 22 months to write this volume), exactly four years after I decided to write Practical Oracle 8i (Remember September 1999, when nobody wanted to employ an Oracle. .. on the project to implement Peoplesoft on Oracle In 1996, he became an independent consultant specializing in administering and tuning Peoplesoft on Oracle In that capacity, Wolfgang has been engaged in several Peoplesoft installation and upgrade projects The particular challenges in tuning Peoplesoft, with often no access to the SQL, motivated him to explore Oracle s cost based optimizer in an effort... completely different issue Eventually, I managed to produce a framework for the task, and realized that I had to write at least three books: the fundamentals, some enhanced stuff, and all the peripherals The book you are holding covers just the fundamentals of cost-based optimization Why Bother? Why do we want to know how the CBO works? Because when we hit a problem where the optimizer produces a very... standardized oracle operations per second, where a “standardized oracle operation” is some special subroutine designed to burn CPU (A 10053 trace file from 10.2 offers corroborative evidence for this.) Whether the number represents cycles per second or operations per second, the difference is only a simple scaling factor The mechanism involved in using the cpuspeed is unchanged Why does Oracle choose... experience with More precisely, it is all about understanding the Oracle cost based optimizer (CBO), how it works, and why it does what it does Jonathan conveys to us his understanding of the Oracle CBO through practice and example, and with this understanding, with this knowledge, new options and solutions become available Put simply, the Oracle CBO is a mathematical model; you feed it inputs (queries,... currently working as a senior consultant and trainer at Trivadis AG (www.trivadis.com) in Zürich, Switzerland If he is not helping one of his customers to get the most out of Oracle, he is somewhere lecturing on optimization or new Oracle database features for developers Christian lives in Ticino, Switzerland, with his wife, Michelle, and their two children, Sofia and Elia He spends a great deal of his . h0" alt="" Cost-Based Oracle Fundamentals ■■■ Jonathan Lewis Lewis_636-6Front.fm Page i Thursday, October 6, 2005 5:36 AM Cost-Based Oracle Fundamentals Copyright. those who post on the comp.databases .oracle newsgroups, those who post on the Oracle- L mailing list, and those who post on Oracle Corporation’s MetaLink forums.