Book Image

Professional Azure SQL Database Administration

By : Ahmad Osama
Book Image

Professional Azure SQL Database Administration

By: Ahmad Osama

Overview of this book

As the cloud version of SQL Server, Azure SQL Database differs in key ways when it comes to management, maintenance, and administration. It’s important to know how to administer SQL Database to fully benefit from all of the features and functionality that it provides. This book addresses important aspects of an Azure SQL Database instance such as migration, backup restorations, pricing policies, security, scalability, monitoring, performance optimization, high availability, and disaster recovery. It is a complete guide for database administrators, and ideal for those who are planning to migrate from on premise SQL Server database to an Azure SQL Server database.

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Table of Contents (13 chapters)
Professional Azure SQL Database Administration
Professional Azure SQL Database Administration
Contributors
Contributors
Preface
Preface
Free Chapter
1
Microsoft Azure SQL Database Primer
Microsoft Azure SQL Database Primer
Azure SQL Database Architecture
Summary
2
Migrating a SQL Server Database to an Azure SQL Database
Migrating a SQL Server Database to an Azure SQL Database
Finding the Migration Benefits
Finding the Blockers
Selecting a Service Model
Selecting a Service Tier
Selecting the Main and Disaster Recovery Region
Selecting a Migration Tool
Azure SQL Database Service Tiers
Determining an Appropriate Service Tier
Determining Compatibility Issues
Determining the Migration Method
Summary
3
Backing Up the Azure SQL Database
Backing Up the Azure SQL Database
Automatic Backups
Manual Backups
Summary
4
Restoring an Azure SQL Database
Restoring an Azure SQL Database
Restore Types
Summary
5
Securing an Azure SQL Database
Securing an Azure SQL Database
Access Control
Proactive Security
Summary
6
Scaling Out Azure SQL Database
Scaling Out Azure SQL Database
Vertical Scaling
Horizontal Scaling
Summary
7
Elastic Pools
Elastic Pools
Introducing Elastic Pools
Elastic Jobs
Summary
8
High Availability and Disaster Recovery
High Availability and Disaster Recovery
High Availability
Disaster Recovery
Summary
9
Monitoring and Tuning Azure SQL Database
Monitoring and Tuning Azure SQL Database
Monitoring an Azure SQL Database using the Azure Portal
Tuning an Azure SQL Database
Summary
Index
Index

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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