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)

Synchronous Replication

The default replication type in active geo-replication is asynchronous. However, if the application needs to have synchronous replication, then you can do so by calling sp_wait_for_database_copy_sync immediately after committing a transaction. This will block the calling thread until all of the committed transactions have been replicated to the secondary.

The procedure can add significant delay to the calling thread if the size of the transaction log is being replicated. It's advised to use this procedure to prevent the loss of critical data only, not all data.

Auto-Failover Groups

Auto-failover groups allow you to automatically recover one or more groups of SQL databases in the event of a region failure. All databases in an auto-failover group should belong to a single server, and they will fail over to a single server as well.

Auto-failover group terms

  • Failover group: A group of databases between the primary server and the secondary server, which are to be...