December 2011
Intermediate to advanced
269 pages
7h 26m
English
book
Expert Indexing in Oracle Database 11g: Maximum Performance for Your Database
by Darl Kuhn, Sam R. Alapati, Bill Padfield
Content preview from Expert Indexing in Oracle Database 11g: Maximum Performance for Your Database
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CHAPTER 7
Tuning Index Usage
In order to tune index usage, it is important to understand the various types of index access paths available to the cost optimizer. The chapter summarizes the most important index access paths available to the optimizer. Often, Oracle database administrators are bewildered when the optimizer chooses not to use what they believe is a very useful index but does a full table scan instead. This chapter devotes attention to exploring some reasons why the optimizer might prefer a full table scan to using an index. You'll also learn how to force the optimizer to use (or not to use) an index. Oracle provides a large number ...
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