Book Image

Oracle Database 11gR2 Performance Tuning Cookbook

By : Ciro Fiorillo
Book Image

Oracle Database 11gR2 Performance Tuning Cookbook

By: Ciro Fiorillo

Overview of this book

Oracle's Database offers great performance, scalability, and many features for DBAs and developers. Due to a wide choice of technologies, successful applications are good candidates to run into performance issues and when a problem arises it's very difficult to identify the cause and the right solution to the problem. The Oracle Database 11g R2 Performance Tuning Cookbook helps DBAs and developers to understand every aspect of Oracle Database that can affect performance. You will be guided through implementing the correct solution in a proactive way before problems arise, and how to diagnose issues on your Oracle database-based solutions. This fast-paced book offers solutions starting from application design and development, through the implementation of well-performing applications, to the details of deployment and delivering best-performance databases. With this book you will quickly learn to apply the right methodology to tune the performance of an Oracle Database, and to optimize application design and SQL and PL/SQL code. By following the real-world examples you will see how to store your data in correct structures and access and manipulate them at a lightning speed. You will learn to speed up sort operations, hack the optimizer and the data loading process, and diagnose and tune memory, I/O, and contention issues. The purpose of this cookbook is to provide concise recipes, which will help you to build and maintain a very high-speed Oracle Database environment.
Table of Contents (21 chapters)
Oracle Database 11gR2 Performance Tuning Cookbook
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

Tuning the Shared Pool


In the previous recipe, we have seen how to inspect and tune the Library Cache, which is a part of the Shared Pool. In this recipe, we will see the memory structures in the Shared Pool and how we can tune it by keeping PL/SQL blocks in it.

How to do it...

The following steps will demonstrate tuning of the Shared Pool:

  1. Connect to the database as SYSDBA:

    CONNECT / AS SYSDBA
    
  2. Inspect which objects can be shared by querying the V$DB_OBJECT_CACHE dynamic performance view:

    COL OWNER FOR A20
    COL NAME FOR A30
    COL TYPE FOR A20
    SELECT OWNER, NAME, TYPE, SHARABLE_MEM
    FROM V$DB_OBJECT_CACHE
    WHERE TYPE IN ('PACKAGE', 'PACKAGE BODY', 'PROCEDURE',
      'FUNCTION', 'TRIGGER')
    AND KEPT = 'NO'
    ORDER BY SHARABLE_MEM;
    
  3. Force a package to be kept in the shared pool:

    EXEC SYS.DBMS_SHARED_POOL.KEEP('SYS.DBMS_SCHEDULER');
    
  4. Show the objects in the shared pool with a certain size:

    SET SERVEROUTPUT ON
    EXEC SYS.DBMS_SHARED_POOL.SIZES(500);
    
  5. Inspect the shared pool reserved memory:

    SELECT * FROM V$SHARED_POOL_RESERVED...