Book Image

SQL Server 2019 Administrator's Guide - Second Edition

By : Marek Chmel, Vladimír Mužný
Book Image

SQL Server 2019 Administrator's Guide - Second Edition

By: Marek Chmel, Vladimír Mužný

Overview of this book

SQL Server is one of the most popular relational database management systems developed by Microsoft. This second edition of the SQL Server Administrator's Guide will not only teach you how to administer an enterprise database, but also help you become proficient at managing and keeping the database available, secure, and stable. You’ll start by learning how to set up your SQL Server and configure new and existing environments for optimal use. The book then takes you through designing aspects and delves into performance tuning by showing you how to use indexes effectively. You’ll understand certain choices that need to be made about backups, implement security policy, and discover how to keep your environment healthy. Tools available for monitoring and managing a SQL Server database, including automating health reviews, performance checks, and much more, will also be discussed in detail. As you advance, the book covers essential topics such as migration, upgrading, and consolidation, along with the techniques that will help you when things go wrong. Once you’ve got to grips with integration with Azure and streamlining big data pipelines, you’ll learn best practices from industry experts for maintaining a highly reliable database solution. Whether you are an administrator or are looking to get started with database administration, this SQL Server book will help you develop the skills you need to successfully create, design, and deploy database solutions.
Table of Contents (17 chapters)
Section 1: Provisioning the SQL Server Environment
Section 2: Server and Database Maintenance
Section 3: High Availability and the Cloud with SQL Server 2019

Accelerated Database Recovery

The described recovery process ensures that every database is in its last known consistent state after SQL Server's startup. The recovery process could take a long time in some cases. A common situation would be when SQL Server is stopped (sometimes unexpectedly) when some long-running transaction is being executed. The recovery process takes almost the same time as executing the transaction. It leads to unacceptable database unavailability. SQL Server 2019 brings a new database-scoped feature that bypasses this issue. The feature is called Accelerated Database Recovery (ADR). ADR basically keeps track of changes in data using internal row versioning. When SQL Server stops working and is restarted, SQL Server does not recover all the transactions from the transaction log, but simply recovers the proper versions of the records from the in-database row version store.

To turn on ADR, we can use the following Data Definition Language (DDL) statement...