PETER A. CARTER - SQL SERVER 2019 ALWAYS ON : supporting 24x7 applications with continuous uptime.
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- Book:SQL SERVER 2019 ALWAYS ON : supporting 24x7 applications with continuous uptime.
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Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/9781484264782 . For more detailed information, please visit http://www.apress.com/source-code .
This book is dedicated to my inspirational children, Reuben, Iris, and Finola.
SQL Server 2019 AlwaysOn is intended to be a quick start guide for DBAs who need to implement high availability and disaster recovery for their SQL Server workloads.
The book begins with a discussion of high availability concepts and methodologies, before a high-level overview of HA/DR technologies. Then, its into the detail. We will discuss how to create Windows clusters, before looking at how to create SQL Server AlwaysOn Failover Clustered Instances.
The focus of the book then turns to AlwaysOn Availability Groups. Here, the book discusses how to create and configure Availability Groups for high availability and disaster recovery, both on Windows and Linux operating systems.
We then look at atypical use cases for AlwaysOn Availability Groups, such as clusterless and domain-independent availability groups, as well as configuring Availability Groups on Azure IaaS and Basic Availability Groups, for SQL Server Standard Edition.
Finally, the book looks at the operational side of AlwaysOn, with chapters covering the administration, monitoring, and troubleshooting of the technology.
I want to offer my thanks to the amazing Chris Dent, who once again helped me with my network configuration for this book.
I would also like to thank Ian Stirk, whose tech reviews always increase the quality of my books, with this book being no exception.
is a SQL Server expert with over 15 years of experience in developing, administering, and architecting SQL Server platforms and data-tier applications. Peter was awarded an MCC by Microsoft in 2011, and it sits alongside his array of MCTS, MCITP, MCSA, and MCSE certifications in SQL Server from version 2005 onward. His passion for SQL Server shows through in everything he does, and his goal is that his passion for the technology will inspire others.
is a freelance SQL Server consultant based in London. In addition to his day job, he is an author, creator of software utilities, and technical reviewer who regularly writes book reviews for www.i-programmer.info .
He covers every aspect of SQL Server and has a specialist interest in performance and scalability. If you require help with your SQL Server systems, feel free to contact him at ian_stirk@yahoo.com or www.linkedin.com/in/ian-stirk-bb9a31/ .
Ian would like to thank Peter Carter, Jonathan Gennick, and Jill Balzano for making this book experience easier for him.
None of us stands alone, and with this in mind, Ian would like to thank these special people: Mr. Courts, Graham Howes, Dave Starkey, Florence Dedeng, Meaza Yohannes, Feven Yohannes, and Adhanet Mehretab.
Ians fee for his work on this book has been donated to World Child Cancer ( www.worldchildcancer.org/ ).
In todays 247 environments that are running mission-critical applications, businesses rely heavily on the availability of their data. Although servers and their software are generally reliable, there is always the risk of a hardware failure or a software bug, each of which could bring a server down. To mitigate these risks, business-critical applications often rely on redundant hardware to provide fault tolerance. If the primary system fails, then the application can automatically fail over to the redundant system. This is the underlying principle of high availability (HA) .
Even with the implementation of HA technologies, there is always a small risk of an event that causes the application to become unavailable. This could be due to a major incident, such as the loss of a data center, due to a natural disaster, or due to an act of terrorism. It could also be caused by data corruption or human error, resulting in the applications data becoming lost or damaged beyond repair.
In these situations, some applications may rely on restoring the latest backup to recover as much data as possible. However, more critical applications may require a redundant server to hold a synchronized copy of the data in a secondary location. This is the underpinning concept of disaster recovery (DR) . This chapter discusses the concepts behind HA and DR.
The amount of time that a solution is available to end users is known as the level of availability, or uptime. To provide a true picture of uptime, a company should measure the availability of a solution from a users desktop. In other words, even if your SQL Server has been running uninterrupted for over a month, users may still experience outages to their solution caused by other factors. These factors can include network outages or an application server failure.
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