Book Image

Oracle Data Guard 11gR2 Administration : Beginner's Guide

Book Image

Oracle Data Guard 11gR2 Administration : Beginner's Guide

Overview of this book

Data Guard is the high availability, disaster recovery and data replication solution for Oracle Databases. With the huge growth of Data Guard it's getting harder to encounter an Oracle DBA not dealing with Data Guard. Since it's a common DBA task to provide high availability of databases, Data Guard is a must-know topic for every Oracle Database Administrator."Oracle Data Guard 11g R2 Beginner's Administration Guide" is a practical guide that provides all the information you will need to configure and maintain Data Guard. This book will show you what Data Guard can really do.By following the practical examples in this book, you'll learn to set up your Data Guard Broker, the management framework for Data Guard configurations. Learn and implement different data protection modes, perform role transitions between databases (switchover and failover) and configure Active Data Guard. Next, we will dive into the features of Snapshot Standby. The book progresses into looking at Data Guard configuration with other Oracle products (such as EM, RAC, and RMAN) and patch databases in Data Guard. The final chapters will cover commonly encountered Data Guard issues and Data Guard best practices, which are very important to make a Data Guard configuration perfect and take maximum advantage of Data Guard properties.
Table of Contents (19 chapters)
Oracle Data Guard 11gR2 Administration Beginner's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Pop Quiz Answers
Index

Data Guard broker components


We can divide the Data Guard broker components into two—client-side and server-side interfaces—as shown in the following diagram:

Oracle Data Guard broker server-side components

The components of the Data Guard broker are the Data Guard Monitor process and the configuration file, as shown in the following diagram:

Data Guard Monitor process (DMON)

The DMON is installed as part of the Oracle database software and manifests as a background component when enabled. The DMON process on the primary database is the owner of the configuration. DMON controls all the databases by using configuration files. It maintains profiles of all the database objects in the configuration in the form of a binary configuration file. The configuration is maintained by the DMON process in all the standby databases of either a physical or a logical configuration. This two-way communication channel is used to pass requests between databases, to monitor the health of all the databases in the...