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Oracle Data Guard 11gR2 Administration : Beginner's Guide

You're reading from   Oracle Data Guard 11gR2 Administration : Beginner's Guide If you're an Oracle Database Administrator it's almost essential to know how to protect and preserve your data. This is the perfect primer to Data Guard that covers all the bases with a totally practical, user-friendly approach.

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Product type Paperback
Published in Jun 2013
Publisher Packt
ISBN-13 9781849687904
Length 404 pages
Edition 1st Edition
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Toc

Table of Contents (19) Chapters Close

Oracle Data Guard 11gR2 Administration Beginner's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Pop Quiz Answers
1. Getting Started FREE CHAPTER 2. Configuring the Oracle Data Guard Physical Standby Database 3. Configuring Oracle Data Guard Logical Standby Database 4. Oracle Data Guard Broker 5. Data Guard Protection Modes 6. Data Guard Role Transitions 7. Active Data Guard, Snapshot Standby, and Advanced Techniques 8. Integrating Data Guard with the Complete Oracle Environment 9. Data Guard Configuration Patching 10. Common Data Guard Issues 11. Data Guard Best Practices Index

Time for action – using flashback on a standby database


Now we are going to see how to recover a dropped/truncated table if a standby database exists, and using the flashback feature. We won't make any changes to the primary database and even the flashback feature may be off on the primary database.

  1. Enabling flashback: To perform recovery of an object, flashback must be enabled on the standby database. Ensure MRP is cancelled before enabling flashback.

    SQL> alter database recover managed standby database cancel;
    Database altered.
    SQL> alter database flashback on;
    Database altered.
    SQL> select db_unique_name,flashback_on from v$database;
    DB_UNIQUE_NAME  FLASHBACK_ON
    --------------- ------------------
    INDIA_UN        YES
    

    On the alert log, you will get the following:

    Thu Dec 20 15:22:21 2012
    RVWR started with pid=25, OS id=7900
    Thu Dec 20 15:22:24 2012
    Allocated 3981120 bytes in shared pool for flashback generation buffer
    Flashback Database Enabled at SCN 6082371
    Completed: alter database...
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