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Troubleshooting Oracle Performance by Christian Antognini

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CHAPTER 5Configuring the Query Optimizer

The query optimizer is directly responsible for the performance of SQL statements. For this reason, it makes sense to take some time to configure it correctly. In fact, without an optimal configuration, the query optimizer may generate inefficient execution plans that lead to poor performance.

The configuration of the query optimizer consists not only of several initialization parameters but also of system statistics and object statistics. (I discussed system and object statistics in Chapter 4.) This chapter will describe how these initialization parameters and statistics influence the query optimizer and present a straightforward and pragmatic road map that will help you achieve a successful configuration. ...

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