You're reading from SQL Server 2019 Administrator's Guide A definitive guide for DBAs to implement, monitor, and maintain enterprise database solutions

Product type Paperback

Published in Sep 2020

Publisher Packt

ISBN-13 9781789954326

Length 522 pages

Edition 2nd Edition

Languages

SQL

Tools

SQL Server

Concepts

Database Administration

Authors (2):

Marek Chmel

Vladimír Mužný

View More author details

Table of Contents (17) Chapters

Preface

1. Section 1: Provisioning the SQL Server Environment

2. Chapter 1: Setting Up SQL Server 2019 FREE CHAPTER

3. Chapter 2: Keeping Your SQL Server Environment Healthy

4. Section 2: Server and Database Maintenance

5. Chapter 3: Implementing Backup and Recovery

6. Chapter 4: Securing Your SQL Server

7. Chapter 5: Working with Disaster Recovery Options

8. Chapter 6: Indexing and Performance

9. Section 3: High Availability and the Cloud with SQL Server 2019

10. Chapter 7: Planning Migration and Upgrade

11. Chapter 8: Automation – Using Tools to Manage and Monitor SQL Server 2019

12. Chapter 9: Configuring Always On High Availability Features

13. Chapter 10: In-Memory OLTP – Why and How to Use it

14. Chapter 11: Combining SQL Server 2019 with Azure

15. Chapter 12: Taming Big Data with SQL Server

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Understanding database mirroring

Database mirroring is a technology used for both HA and DR, which allows for rich configuration. Mirroring is largely replaced by other features of MS SQL Server, mainly Always On Availability Groups. Mirroring should not be considered a primary HA/DR option for new deployments; however, it's still important to understand mirroring, especially because of migrations from older SQL Server installations, which may still use mirroring for HA/DR.

Mirroring uses up to three server roles:

Principal
Mirror
Witness

The principal server holds the database that is mirrored. This database has to be configured with the Full Recovery model in order to participate in the mirroring configuration. The mirror server holds a mirrored copy of the database, but unlike replication or log shipping, this database is not available for user access. The witness server can be configured in case you would like to utilize automatic failover...