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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

What is Data Guard?


Data Guard, which was introduced as the standby database in Oracle database Version 7.3 under the name of Data Guard with Version 9i, is a data protection and availability solution for Oracle databases. The basic function of Oracle Data Guard is to keep a synchronized copy of a database as standby, in order to make provision, incase the primary database is inaccessible to end users. These cases are hardware errors, natural disasters, and so on. Each new Oracle release added new functionalities to Data Guard and the product became more and more popular with offerings such as data protection, high availability, and disaster recovery for Oracle databases.

Using Oracle Data Guard, it's possible to direct user connections to a Data Guard standby database automatically with no data loss, in case of an outage in the primary database. Data Guard also offers taking advantage of the standby database for reporting, test, and backup offloading. Corruptions on the primary database may be fixed automatically by using the non-corrupted data blocks on the standby database. There will be minimal outages (seconds to minutes) on the primary database in planned maintenances such as patching and hardware changes by using the switchover feature of Data Guard, which changes the roles of the primary and standby databases. All of these features are available with Data Guard, which doesn't require an installation but a cloning and configuration of the Oracle database.

A Data Guard configuration consists of two main components: primary database and standby database. The primary database is the database for which we want to take precaution for its inaccessibility. Fundamentally, changes on the data of the primary database are passed through the standby database and these changes are applied to the standby database in order to keep it synchronized.

The following figure shows the general structure of Data Guard:

Let's look at the standby database and its properties more closely.

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Oracle Data Guard 11gR2 Administration : Beginner's Guide
Published in: Jun 2013
Publisher: Packt
ISBN-13: 9781849687904
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