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You're reading from  Professional Azure SQL Database Administration

Product typeBook
Published inJul 2018
Reading LevelBeginner
PublisherPackt
ISBN-139781789538854
Edition1st Edition
Languages
SQL
Tools
Azure
Concepts
Database Administration
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Author (1)
Ahmad Osama
Ahmad Osama
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Ahmad Osama

Ahmad Osama works for Pitney Bowes Pvt. Ltd. as a technical architect and is a former Microsoft Data Platform MVP. In his day job, he works on developing and maintaining high performant, on-premises and cloud SQL Server OLTP environments as well as deployment and automating tasks using PowerShell. When not working, Ahmad blogs at DataPlatformLabs and can be found glued to his Xbox.
Read more about Ahmad Osama

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High Availability

High availability refers to providing business continuity when the physical server hosting the Azure SQL Database fails.

As discussed in Chapter 1, Microsoft Azure SQL Database Primer, an Azure SQL Database is hosted on three servers – one primary and two secondary servers:

Figure 8.1: Azure SQL Database is Hosted on Three Servers

The toyfactory database consists of three servers; one primary and at least two secondary servers. The Azure SQL Server is just a logical server name used for connection. When an application sends a connection request, the gateway finds out the current primary server and routes the request to the primary server.

The primary and secondary servers are within the same datacentre and together form a quorum-set.

All read and writes are made to the primary server. Azure SQL Database uses a quorum-based commit method that makes sure that the data is hardened at the primary server and replicated to at least one secondary server before the transaction...

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Professional Azure SQL Database Administration
Published in: Jul 2018Publisher: PacktISBN-13: 9781789538854
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Ahmad Osama

Ahmad Osama works for Pitney Bowes Pvt. Ltd. as a technical architect and is a former Microsoft Data Platform MVP. In his day job, he works on developing and maintaining high performant, on-premises and cloud SQL Server OLTP environments as well as deployment and automating tasks using PowerShell. When not working, Ahmad blogs at DataPlatformLabs and can be found glued to his Xbox.
Read more about Ahmad Osama

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