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OCP Instructors Guide for Oracle DBA Certification

Chapter 7 - Tuning and Performance

Allocating too Much Memory to the Shared Pool and Data Buffers

There is another problem that can occur that is not related to paging and swapping.  Over allocating memory to the shared pool may cause Oracle to spend too much CPU time controlling the large memory area.   If you are experiencing poor performance problems, have high Oracle CPU utilization and a very large shared pool, you may want to decrease the shared pool size even if swapping and paging is not occurring.


Tuning Oracle can be a challenging task.   Oracle provides the administrator with a host of tuning knobs that are used to tailor the Oracle database environment to meet an application’s specific processing requirements.   There is a bewildering array of tools and information that can be used to increase the performance of an Oracle database.  A review of some of the more important points covered in this chapter should help:

  • Once again, read the Oracle Tuning and Performance manuals.

  • Learn how to use the toolset used for performance monitoring and performance problem identification. Learning how to read an explain plan and understanding the information contained in the v$ tables will give you a good start.  Follow that with STATSPACK, Oracle Tuning Pack and the Oracle traces.

The above text is an excerpt from:

OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot

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