Book Image

Professional Azure SQL Managed Database Administration - Third Edition

By : Ahmad Osama, Shashikant Shakya
Book Image

Professional Azure SQL Managed Database Administration - Third Edition

By: Ahmad Osama, Shashikant Shakya

Overview of this book

Despite being the cloud version of SQL Server, Azure SQL Database and Azure SQL Managed Instance stands out in various aspects when it comes to management, maintenance, and administration. Updated with the latest Azure features, Professional Azure SQL Managed Database Administration continues to be a comprehensive guide for becoming proficient in data management. The book begins by introducing you to the Azure SQL managed databases (Azure SQL Database and Azure SQL Managed Instance), explaining their architecture, and how they differ from an on-premises SQL server. You will then learn how to perform common tasks, such as migrating, backing up, and restoring a SQL Server database to an Azure database. As you progress, you will study how you can save costs and manage and scale multiple SQL databases using elastic pools. You will also implement a disaster recovery solution using standard and active geo-replication. Finally, you will explore the monitoring and tuning of databases, the key features of databases, and the phenomenon of app modernization. By the end of this book, you will have mastered the key aspects of an Azure SQL database and Azure SQL managed instance, including migration, backup restorations, performance optimization, high availability, and disaster recovery.
Table of Contents (14 chapters)
13
Index

Accelerated database recovery (ADR)

Accelerated database recovery, or ADR, is a new database recovery process that greatly increases availability and decreases database recovery time in scenarios such as crash recovery (database recovery in the event of a server/database crash) and long-running transaction rollback (for example, a large bulk insert or an index rebuild rollback).

An SQL database consists of data and a transaction log file. A data file contains the table data. A transaction log file keeps track of all the changes made to the data and the schema; for example, if there is an insert in a table, the transaction log file contains the insert statement and whether the insert statement was committed or not.

The standard database recovery process

To better understand ADR, let's first get an understanding of the standard database recovery process:

The standard database recovery process without ADR

Figure 9.7: The recovery phase without ADR

Note

Image taken from https://docs.microsoft...