Cost-Based Oracle Fundamentals

Ranked #36 in Oracle

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 columns--and the optimizer flatly refuses to use...

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