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

Time for action – changing the redo transport user


Follow these steps to change the redo transport user in the Data Guard configuration:

  1. Create a new database, which will be used for redo transport in the primary database. Grant the SYSOPER privileges to this user and ensure that the standby database has applied these changes:

    SQL> CREATE USER DGUSER IDENTIFIED BY SOMEPASSWORD;
    SQL> GRANT SYSOPER to DGUSER;
    

    Tip

    Don't forget that if the password expires periodically for this user, this will pose a problem in Data Guard redo transport. So ensure that the default profile does not include the PASSWORD_LIFE_TIME and PASSWORD_GRACE_TIME settings. If it does, choose another profile for this user.

  2. Stop the redo transport from the primary database to the standby databases. We can execute the DEFER command to defer the log destination with the ALTER SYSTEM statement:

    SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_2 = 'DEFER';
    
  3. Change the redo transport user by setting the REDO_TRANSPORT_ USER...