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Oracle Database 11gR2 Performance Tuning Cookbook

You're reading from Oracle Database 11gR2 Performance Tuning Cookbook

Product type Book

Published in Jan 2012

Publisher Packt

ISBN-13 9781849682602

Pages 542 pages

Edition 1st Edition

Languages

Concepts

Database Administration

Author (1):

Ciro Fiorillo

Table of Contents (21) Chapters

Oracle Database 11gR2 Performance Tuning Cookbook

Credits

About the Author

Acknowledgement

About the Reviewers

www.PacktPub.com

Preface

1. Starting with Performance Tuning

2. Optimizing Application Design

3. Optimizing Storage Structures

4. Optimizing SQL Code

5. Optimizing Sort Operations

6. Optimizing PL/SQL Code

7. Improving the Oracle Optimizer

8. Other Optimizations

9. Tuning Memory

10. Tuning I/O

11. Tuning Contention

Dynamic Performance Views

A Summary of Oracle Packages Used for Performance Tuning

Index

Using asynchronous I/O

In this recipe we will see how to use asynchronous I/O to obtain better performance from our I/O subsystem.

How to do it...

The following steps will describe the use of asynchronous I/O:

Connect to the database as SYSDBA:
```
CONNECT / AS SYSDBA
```
Verify whether asynchronous I/O is enabled:
```
SHOW PARAMETER FILESYSTEMIO_OPTIONS
```

Enable asynchronous I/O, if it is not enabled:

ALTER SYSTEM SET FILESYSTEMIO_OPTIONS=SETALL SCOPE=SPFILE;

Shut down the database instance:
```
SHUTDOWN IMMEDIATE
```
Start and open the database:
```
STARTUP OPEN
```
Verify the change in system configuration:
```
SHOW PARAMETER FILESYSTEMIO_OPTIONS
```

How it works...

The Oracle database may use synchronous or asynchronous I/O calls. With synchronous I/O, when an I/O request is submitted to the Operating System, the write process will block until the operation is completed.

Using asynchronous I/O, while the I/O request is still executing, the calling process continues its work without blocking. This is the reason why asynchronous...

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Authors (1)

Ciro Fiorillo

Ciro Fiorillo is an IT professional and consultant with experience of more than a decade in different roles (developer, analyst, DBA, project manager, data and software architect) among software industries. He has worked on different technologies and architectures, such as Oracle, SQL Server, Delphi, C# and .NET Framework, C/C++, Java, PHP, COBOL, Fortran, and Tibco. Ciro is currently employed as Lead Software and Data Architect with FinWin Srl, a software house specializing in banking and loans applications. As a freelancer he writes articles for websites and printed magazines about software and computing, participates in workshops, and teaches C++ and Fortran parallel programming with Intel Software tools. Ciro can be reached at ciro@cirofiorillo.com.

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