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

New ASM features and RAC


There are many new features in Oracle 11g RAC that are introduced with ASM enhancements. Many of these involve ASM configuration.

New SYSASM privilege for Oracle 11g R1 ASM

Introduced in Oracle 11g R1, the SYSASM privilege allows you to separate the database operating system credentials from ASM credentials. This can be useful in today's era of auditing controls and compliance to fulfill requirements for Sarbanes Oxley (SOX), as well as to divide storage support between system administrators and DBA staff members.

For Oracle 11g, you should now use the SYSASM privilege instead of the SYSDBA privilege to connect to and administer an ASM instance. Although before Oracle 11g R2, you were still able to manage ASM from SYSDBA, it is not recommended. In the event that you still decide to use the SYSDBA privilege to connect to an ASM instance, Oracle will send a warning to the alert log file because commands that you run using SYSDBA privileges on an ASM instance are supposed...