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Oracle 11g R1/R2 Real Application Clusters Essentials

You're reading from   Oracle 11g R1/R2 Real Application Clusters Essentials Design, implement, and support complex Oracle 11g RAC environments for real world deployments

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Product type Paperback
Published in May 2011
Publisher Packt
ISBN-13 9781849682664
Length 552 pages
Edition 1st Edition
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Table of Contents (20) Chapters Close

Oracle 11g R1/R2 Real Application Clusters Essentials
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. High Availability FREE CHAPTER 2. Oracle 11g RAC Architecture 3. Clusterware Installation 4. Automatic Storage Management 5. Managing and Troubleshooting Oracle 11g Clusterware 6. RAC Database Administration and Workload Management 7. Backup and Recovery 8. Performance Tuning 9. Oracle 11g Clusterware Upgrade 10. Real-world Scenarios 11. Enabling RAC for EBS 12. Maximum Availability Additional Resources and Tools for the Oracle RAC Professional Index

ASM backup strategies


You may have been surprised when you first heard of backup strategies for ASM because ASM doesn't have any physical structure (no physical datafiles); it is just a special kind of instance, and there is actually no need to back it up. Having said so, it is strongly advised to back up all the important information in case of a disaster.

Pre-Oracle ASM 11g, there was no direct option to back up the ASM configuration and its metadata information. However, the recommended option in pre-11g was to gather the important information by spooling it in a text or HTML file through querying the ASM specific dynamic views, such as V$ASM_DISK, V$ASM_FILES, V$ASM_DISKGROUP, V$ASM_CLIENT, and so on.

md_backup and md_restore commands

With 11g R2, Oracle provides two new commands: md_backup and md_restore, which can be used within the ASMCMD utility to backup and restore the disk group metadata.

The purpose of the md_backup command is to back up the metadata for one or more disk groups,...

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