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Easy Oracle Automation
Chapter 7 -
Application and SQL Management

Introduction to Tuning

Two important objectives in tuning any application or database system are to reduce the response time for its end users and to minimize the consumption of resources for the system. Tuning of SQL statements is a major factor in determining the system performance of the database.

SQL tuning is performed by the execution of the following steps:

  • Identify the top SQL statements that utilize a major portion of the application workload and system resources.

  • Analyze the execution plans from the query optimizer.

  • Improve the execution plan of poorly performing SQL statements.

The above steps have to be repeated until performance results are satisfactory for the system.These steps will be examined in more detail in the next sections.

SQL Tuning Features

Top SQL statements or high-load SQL statements are those statements that are poorly performing and resource draining, which in turn slows the entire database and any associated applications. To identify high-load SQL statements, Oracle Database 10g has provided a handful of features, some of which are entirely new to this release. These features are Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), v$sql view, SQL Trace, and Custom Workload.

The above text is an excerpt from:

Easy Oracle Automation
Oracle10g Automatic Storage, Memory and Diagnostic Features

ISBN 0-9745993-6-0

by Dr. Arun Kumar R.

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