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

Inlining PL/SQL code


In this recipe, we will see the benefits of inlining the PL/SQL code in our functions and procedures.

How to do it...

The following steps will demonstrate how to make PL/SQL functions inline:

  1. Connect to the SH schema:

    CONNECT sh@TESTDB/sh
    
  2. Create a SIMPLE_FUNCTION function, which returns the area of a triangle given the length of he base and the height:

    CREATE OR REPLACE FUNCTION SIMPLE_FUNCTION (N IN NUMBER,
     K IN NUMBER) RETURN NUMBER
    IS
    BEGIN
      RETURN (N * K / 2);
    END;
    /
    
  3. Create a STRESS procedure, which calculates the area for a number of triangles using the SIMPLE_FUNCTION function created in step 2:

    CREATE OR REPLACE PROCEDURE STRESS(ANUM NUMBER)
    IS
      AVAL NUMBER;
      T1 NUMBER;
    BEGIN
      T1 := DBMS_UTILITY.get_time;
      FOR J IN 1..ANUM LOOP
        AVAL := SIMPLE_FUNCTION (50,ANUM);
      END LOOP;
      DBMS_OUTPUT.PUT_LINE('TIME: ' ||
        (DBMS_UTILITY.get_time - T1));
    END;
    /
    
  4. Create the same procedure as in the previous step, inlining the SIMPLE_FUNCTION by adding a PRAGMA INLINE...