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Professional Azure SQL Database Administration
Professional Azure SQL Database Administration

Professional Azure SQL Database Administration: Equip yourself with the skills to manage and maintain data in the cloud , Second Edition

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Professional Azure SQL Database Administration

Migrating a SQL Server Database to an Azure SQL Database

Learning Objectives

By the end of this lesson, you will be able to:

  • Select a service tier for your migrated Azure SQL Database based on your needs
  • Explain Database Transaction Units (DTUs)
  • Identify and fix SQL Server-to-Azure SQL Database compatibility issues
  • Migrate from an on-premises database to Azure SQL Database using different tools

In this lesson, you'll learn how to find and fix compatibility issues, determine an appropriate service tier, figure out a migration strategy and tool and migrate to the cloud.

Introduction

Migrating an on-premises SQL Server database is an important task and should be planned to perfection. An ideal migration methodology should be like the one shown in the following diagram:

Figure 2.1: Migration methodology

Finding the Migration Benefits

You should first analyze and find out the benefits of migrating an on-premises SQL database to an Azure SQL database. Migration involves a lot of time, effort, and cost, and it shouldn't be done just for the sake of having a cloud database.

Finding the Blockers

The next step is to find out the compatibility issues that may stop you from migrating to Azure SQL Database.

Selecting a Service Model

The next step is to find out whether the database will be deployed individually, in an elastic pool, or as a SQL managed database instance. This is important as the service model will affect the overall pricing, service tier, performance, and management of the Azure SQL Database.

Selecting a Service Tier

The next step is to...

DTU Pricing Models

Database Transaction Units

The amount of resources (CPUs, I/O, and RAM) to be assigned to an Azure SQL Database in a particular service tier is calculated in Database Transaction Units (DTUs).

DTUs guarantee that an Azure SQL Database will always have a certain amount of resources and a certain level of performance (offered under a particular DTU model) at any given point of time, independent of other SQL databases on the same Azure SQL server or across Microsoft Azure.

The ratio for the aforementioned resources was calculated by Microsoft by running an Online Transaction Processing (OLTP) benchmark.

The DTU amount signifies how powerful an Azure SQL Database is. For example, if a workload of, say, 5 queries takes 80 seconds on the Basic tier with 5 DTUs, then it'll take around 4 seconds on the Standard S3 tier with 100 DTUs.

There are four pricing tiers available in the DTU-based pricing model:

Note

The DTU is the measure of Azure SQL Database performance. This is discussed...

Choosing Between a vCore Pricing Model and DTU-based Service Tiers

When choosing between vCore and DTU-based pricing tiers, consider the following.

Licensing

A vCore pricing model provides up to 30% cost savings by using existing on-premises SQL Server Standard or Enterprise licenses with software assurance. Therefore, if you are migrating an existing on-premises SQL Server infrastructure, consider opting for a vCore pricing model.

Flexibility

A DTU-based model bundles up the compute, IOPs, and storage under DTUs and provides a pre-configured range of varying DTU amounts for different types of workloads. It's therefore best suited for when you need a simple pre-configured option.

A vCore model provides flexibility when selecting compute and storage options and is therefore best when you want more transparency with control and over the compute and storage options.

Consider a scenario where you have a database with high compute requirements and low storage requirements; say, 125 DTUs with...

Azure Database Migration Services

Azure Database Migration Services, or DMS, is a fully managed Azure service that enables seamless migrations from multiple data sources to Azure databases.

Here are some examples of migrations that DMS can do:

  • Migrate on-premises SQL Server to Azure SQL Database or SQL managed instance. Supports both online and offline migrations.
  • Migrate Azure SQL Database to SQL database managed instances.
  • Migrate an AWS SQL Server RDS instance to Azure SQL Database or SQL managed instance.
  • Migrate MySQL to Azure Database for MySQL.
  • Migrate PostgreSQL to Azure Database for PostgreSQL.
  • Migrate MongoDB to Azure Cosmos DB Mongo API.

    Note

    Online migration is a migration with zero downtime or near-zero downtime during the cut-over to the migrated database.

Exercise: Migrating a SQL Server Database to Azure SQL Database Using Azure DMS

Note

In the exercise, the source database is on a SQL server on Azure VM. To migrate an on-premises database, site-to...

Summary

Migrating to an Azure SQL database is an important task and should be planned to perfection. This lesson talked about a migration strategy that you should follow when migrating from an on-premises database to an Azure SQL database:

  1. Find the migration benefits.
  2. Find the blockers.
  3. Select a service model.
  4. Select a service tier.
  5. Select the main region and the disaster recovery region.
  6. Select a migration tool.

This lesson also talked about how to choose a service tier and covered different migration tools to migrate the data and the schema from an on-premises SQL Server database to an Azure SQL database. In the next lesson, we will learn how to perform manual and automatic backups that are unique to Azure SQL databases.

Left arrow icon Right arrow icon

Key benefits

  • Explore ways to create shards and elastic pools to scale Azure SQL databases
  • Automate common management tasks with PowerShell
  • Implement over 40 practical activities and exercises to reinforce your learning

Description

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.

Who is this book for?

If you're a database administrator, database developer, or an application developer interested in developing new applications or migrating existing ones with Azure SQL database, this book is for you. Prior experience of working with an on-premise SQL Server or Azure SQL database along with a basic understanding of PowerShell scripts and C# code is necessary to grasp the concepts covered in this book.

What you will learn

  • Understand Azure SQL Database configuration and pricing options
  • Provision a new SQL database or migrate an existing on-premise SQL Server database to Azure SQL Database
  • Backup and restore Azure SQL Database
  • Secure an Azure SQL database
  • Scale an Azure SQL database
  • Monitor and tune an Azure SQL database
  • Implement high availability and disaster recovery with Azure SQL Database
  • Automate common management tasks with PowerShell
  • Develop a scalable cloud solution with Azure SQL Database
  • Manage, maintain, and secure managed instances
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jul 19, 2019
Length: 562 pages
Edition : 2nd
Language : English
ISBN-13 : 9781789802542
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Publication date : Jul 19, 2019
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Language : English
ISBN-13 : 9781789802542
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Table of Contents

10 Chapters
Microsoft Azure SQL Database Primer Chevron down icon Chevron up icon
Migrating a SQL Server Database to an Azure SQL Database Chevron down icon Chevron up icon
Backing Up an Azure SQL Database Chevron down icon Chevron up icon
Restoring an Azure SQL Database Chevron down icon Chevron up icon
Securing an Azure SQL Database Chevron down icon Chevron up icon
Scaling out an Azure SQL Database Chevron down icon Chevron up icon
Azure SQL Database Elastic Pools Chevron down icon Chevron up icon
High Availability and Disaster Recovery Chevron down icon Chevron up icon
Monitoring and Tuning Azure SQL Database Chevron down icon Chevron up icon
Database Features Chevron down icon Chevron up icon

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