Oracle Database 10g: Data Guard Administration Electronic Presentation D17316GC20 Edition 2.0 October 2006 D47658 đ Author Copyright â 2006, Oracle All rights reserved Donna K Keesling Disclaimer Technical Contributors and Reviewers Christopher D Andrews Harald van Breederode Larry Carpenter Michael Cebulla Joel Goodman This document contains proprietary information and is protected by copyright and other intellectual property laws You may copy and print this document solely for your own use in an Oracle training course The document may not be modified or altered in any way Except where your use constitutes "fair use" under copyright law, you may not use, share, download, upload, copy, print, display, perform, reproduce, publish, license, post, transmit, or distribute this document in whole or in part without the express authorization of Oracle The information contained in this document is subject to change without notice If you find any problems in the document, please report them in writing to: Oracle University, 500 Oracle Parkway, Redwood Shores, California 94065 USA This document is not warranted to be error-free Restricted Rights Notice Editors Arijit Ghosh Daniel Milne Graphic Designer Satish Bettegowda If this documentation is delivered to the United States Government or anyone using the documentation on behalf of the United States Government, the following notice is applicable: U.S GOVERNMENT RIGHTS The U.S Government’s rights to use, modify, reproduce, release, perform, display, or disclose these training materials are restricted by the terms of the applicable Oracle license agreement and/or the applicable U.S Government contract Trademark Notice Publishers Srividya Rameshkumar Jobi Varghese Oracle, JD Edwards, PeopleSoft, and Siebel are registered trademarks of Oracle Corporation and/or its affiliates Other names may be trademarks of their respective owners Oracle Data Guard: Overview Copyright © 2006, Oracle All rights reserved Objectives After completing this lesson, you should be able to the following: • Describe the factors that affect planned and unplanned downtime • Describe the basic components of Oracle Data Guard • Explain the differences between physical and logical standby databases • Explain the benefits of creating a Data Guard environment • Explain the use of Data Guard in high-availability architectures 1-2 Copyright © 2006, Oracle All rights reserved Causes of Data Loss Hardware & system errors 49% Human errors 36% Computer viruses Software corruption Natural disasters 7% 4% 3% Source: Disaster Recovery Journal 1-3 Copyright © 2006, Oracle All rights reserved Understanding the Causes of Downtime Storage failure Computer failures Unplanned downtime Human error Data failures Corruption Planned downtime 1-4 Data changes System changes Copyright © 2006, Oracle All rights reserved Site failure What Is Oracle Data Guard? Standby database Redo transport Oracle Net Primary database Database 1-5 Database copy Copyright © 2006, Oracle All rights reserved Types of Standby Databases There are two types of standby databases: • Physical standby database – Identical to the primary database on a block-for-block basis – Synchronized with the primary database through application of redo data received from the primary database • Logical standby database – Shares the same schema definition – Synchronized with the primary database by transforming the data in the redo received from the primary database into SQL statements and then executing the SQL statements 1-6 Copyright © 2006, Oracle All rights reserved Oracle Data Guard Broker Framework Oracle Management Server Repository Agent Agent Standby database Primary database Data Guard broker Enterprise Manager Data Guard broker CLI management client 1-7 Copyright © 2006, Oracle All rights reserved Types of Services There are three types of services provided with Data Guard: • Redo transport services • Log apply services – Redo Apply – SQL Apply ã Role-management services 1-8 Copyright â 2006, Oracle All rights reserved