Book Image

Oracle 11g R1/R2 Real Application Clusters Essentials

Book Image

Oracle 11g R1/R2 Real Application Clusters Essentials

Overview of this book

Oracle RAC or Real Application Clusters is a grid computing solution that allows multiple nodes (servers) in a clustered system to mount and open a single database that resides on shared disk storage. Should a single system (node) fail, the database service will still be available on the remaining nodes. Oracle RAC is an integral part of the Oracle database setup. You have one database with multiple users accessing it, in real time. This book will enable DBAs to get their finger on the pulse of the Oracle 11g RAC environment quickly and easily.This book will cover all areas of the Oracle RAC environment and is indispensable if you are an Oracle DBA who is charged with configuring and implementing Oracle11g R1, with bonus R2 information included. This book presents a complete method for the configuration, installation, and design of Oracle 11g RAC, ultimately enabling rapid administration of Oracle 11g RAC environments.This practical handbook documents how to administer a complex Oracle 11g RAC environment. Packed with real world examples, expert tips and troubleshooting advice, the book begins by introducing the concept of Oracle RAC and High Availability. It then dives deep into the world of RAC configuration, installation and design, enabling you to support complex RAC environments for real world deployments. Chapters cover Oracle RAC and High Availability, Oracle 11g RAC Architecture, Oracle 11g RAC Installation, Automatic Storage Management, Troubleshooting, Workload Management and much more. By following the practical examples in this book, you will learn every concept of the RAC environment and how to successfully support complex Oracle 11g R1 and R2 RAC environments for various deployments within real world situations. This book is the updated release of our previous Oracle 11g R1/R2 Real Application Clusters Handbook. If you already own a copy of that Handbook, there is no need to upgrade to this book.
Table of Contents (20 chapters)
Oracle 11g R1/R2 Real Application Clusters Essentials
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Deleting an RAC database instance


When you find that an RAC database in your environment is overdone in terms of the number of active instances, or due to the non-criticality of the application, you can delete an instance.

Relax readers, we are not going to demonstrate this through several screenshots; rather, we will explain this process through a few simple steps that can be easily followed.

Like adding an instance, deleting an instance can also be done using DBCA, Enterprise Manager, and manual methods. However, as we mentioned earlier, the DBCA is one of the simplest ways to perform these operations, so we recommend that you use the DBCA.

You will need to perform the following steps before you start deleting the instance:

  • If there is no recent OCR file backup, perform the OCR file backup

  • Modify or remove services that are associated with the deleted instance

In order to perform the delete instance operation, the following procedure will need to be completed:

  1. From the command prompt of Node...