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Professional Azure SQL Database Administration

You're reading from   Professional Azure SQL Database Administration Equip yourself with the skills to manage and maintain data in the cloud

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Product type Paperback
Published in Jul 2019
Publisher Packt
ISBN-13 9781789802542
Length 562 pages
Edition 2nd Edition
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Author (1):
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Ahmad Osama Ahmad Osama
Author Profile Icon Ahmad Osama
Ahmad Osama
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Table of Contents (11) Chapters Close

About the Book 1. Microsoft Azure SQL Database Primer FREE CHAPTER 2. Migrating a SQL Server Database to an Azure SQL Database 3. Backing Up an Azure SQL Database 4. Restoring an Azure SQL Database 5. Securing an Azure SQL Database 6. Scaling out an Azure SQL Database 7. Azure SQL Database Elastic Pools 8. High Availability and Disaster Recovery 9. Monitoring and Tuning Azure SQL Database 10. Database Features

Disaster Recovery

DR refers to having business continuity in the event of a natural disaster or hacking that terminates an entire Azure region.

There are two ways to implement DR: standard geo-replication and active geo-replication.

Standard Geo-Replication

Standard geo-replication asynchronously replicates committed transactions from an online primary to an offline secondary in a predefined Azure region:

Figure 8.7: Figure 8.7: Standard geo-replication

In standard geo-replication:

Only one secondary is allowed in a DR paired region.

Each region has a DR pair that can only host the secondary database. The secondary database is offline and is unreadable. However, it is visible in the master database. The secondary database is readable when failover is done.

Note

The entire list of DR paired regions can be found here: https://docs.microsoft.com/en-us/azure/best-practices-availability-paired-regions.

  • The secondary database is priced at discounted rates as it's unreadable.
  • ...
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