January 2012
Intermediate to advanced
542 pages
11h 28m
English
Content preview from Oracle Database 11gR2 Performance Tuning CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 7. Improving the Oracle Optimizer
In this chapter, we will cover:
- Exploring optimizer hints
- Collecting statistics
- Using histograms
- Managing stored outlines
- Introducing Adaptive Cursor Sharing for bind variable peeking
- Creating SQL Tuning Sets
- Using the SQL Tuning Advisor
- Configuring and using SQL Baselines
Introduction
In this chapter, we discuss the query optimizer, which is a built-in component of the Oracle database. The optimizer chooses the most efficient way to execute a SQL statement, using three steps:
- Query transformation.
- Estimation.
- Plan generation.
The query transformation step accepts the parsed statement, divides it into query blocks (for example, identifying a subquery), and determines if it's better to transform the query blocks into ...
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