The insights that Jonathan provides into the workings of the
cost-based optimizer will make a DBA a better designer, and a
Developer a better SQL coder. Both groups will become better
troubleshooters. -- Thomas Kyte, VP (Public Sector), Oracle
Corporation
The question, "Why isn't Oracle using my index?" must be one of
the most popular (or perhaps unpopular) questions ever asked on the
Oracle help forums. You've picked exactly the right columns, you've
got them in the ideal order, you've computed statistics, you've
checked for null columnsand the optimizer flatly refuses to use
your index unless you hint it. What could possibly be going
wrong?
If you've suffered the frustration of watching the optimizer do
something completely bizarre when the best execution plan is
totally obvious, or spent hours or days trying to make the
optimizer do what you want it to do, then this is the book you
need. Youll come to know how the optimizer "thinks," understand why
it makes mistakes, and recognize the data patterns that make it go
awry. With this information at your fingertips, you will save an
enormous amount of time on designing and trouble-shooting your
SQL.
The cost-based optimizer is simply a piece of code that contains
a model of how Oracle databases work. By applying this model to the
statistics about your data, the optimizer tries to efficiently
convert your query into an executable plan. Unfortunately, the
model can't be perfect, your statistics can't be perfect, and the
resulting execution plan may be far from perfect.
In "Cost-Based Oracle Fundamentals," the first book in a series
of three, Jonathan Lewisone of the foremost authorities in this
fielddescribes the mostcommonly used parts of the model, what the
optimizer does with your statistics, and why things go wrong. With
this information, youll be in a position to fix entire problem
areas, not just single SQL statements, by adjusting the model or
creating more truthful statistics.
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