Book Image

Professional Azure SQL Database Administration - Second Edition

By : Ahmad Osama
Book Image

Professional Azure SQL Database Administration - Second Edition

By: Ahmad Osama

Overview of this book

Despite being the cloud version of SQL Server, Azure SQL Database differs in key ways when it comes to management, maintenance, and administration. This book shows you how to administer Azure SQL Database to fully benefit from its wide range of features and functionalities. Professional Azure SQL Database Administration begins by covering the architecture and explaining the difference between Azure SQL Database and the on-premise SQL Server to help you get comfortable with Azure SQL Database. You’ll perform common tasks such as migrating, backing up and restoring a SQL Server database to an Azure database. As you progress, you’ll understand how you can reduce costs, and manage and scale multiple SQL databases using elastic pools. You’ll also implement a disaster recovery solution using standard and active geo-replication. Whether it is learning different techniques to monitor and tune an Azure SQL Database or improving performance using in-memory technology, this book will enable you to make the most out of Azure SQL database features and functionality for data management solutions. By the end of this book, you’ll be well-versed with key aspects of an Azure SQL Database instance, such as migration, backup restorations, performance optimization, high availability, and disaster recovery.
Table of Contents (11 chapters)

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.
  • ...