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)

Introducing Elastic Pools

Azure SQL Database Elastic Pool is a cost-effective solution for managing and scaling a group or a pool of Azure SQL databases, with a utilization pattern characterized by low average utilization and infrequent spikes.

Figure 7.1: Elastic pools

All databases in an elastic pool:

  • Belong to one Azure SQL server
  • Share a set number of eDTUs
  • Share a set amount of elastic pool storage
  • Are priced for eDTUs and not individual databases like DTUs
  • Can scale up to the given maximum amount of eDTUs
  • Have a guaranteed minimum number of eDTUs

When Should You Consider Elastic Pools?

In Lesson 6, Scaling Out an Azure SQL Database, we worked on sharding the toystore database into four individual shards. Each shard had 50 pieces of a customer's/tenant's data. Let's say that each individual database is sized to a Standard S3 service tier, for example, 100 DTUs, and has the DTU utilization levels shown in the following graph:

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