You're reading from SQL Server 2019 Administrator's Guide - Second Edition

Product typeBook

Published inSep 2020

Reading LevelBeginner

PublisherPackt

ISBN-139781789954326

Edition2nd Edition

Languages

SQL

Concepts

Database Administration

Authors (2):

Marek Chmel

Vladimír Mužný

View More author details

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...

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SQL Server 2019 Administrator's Guide - Second Edition

Published in: Sep 2020Publisher: PacktISBN-13: 9781789954326

Authors (2)

Marek Chmel

Marek Chmel is a senior CSA at Microsoft, specializing in data and AI. He is a speaker and trainer with more than 15 years' experience. He has been a Data Platform MVP since 2012. He has earned numerous certifications, including Azure Architect, Data Engineer and Scientist Associate, Certified Ethical Hacker, and several eLearnSecurity certifications. Marek earned his master's degree in business and informatics from Nottingham Trent University. He started his career as a trainer for Microsoft Server courses and later worked as SharePoint team lead and principal database administrator. He has authored two books, Hands-On Data Science with SQL Server 2017 and SQL Server 2017 Administrator's Guide.
Read more about Marek Chmel

Vladimír Mužný

Vladimír Mužný has been a freelance developer and consultant since 1997. He has been a Data Platform MVP since 2017, and he has earned certifications such as MCSE: Data Management and Analytics and MCT. His first steps with SQL Server were done on version 6.5, and from that time on, he has worked with all following versions of SQL Server. Now Vladimir teaches Microsoft database courses, participates in SQL Server adoption at various companies, and collaborates on projects for production tracking and migrations.
Read more about Vladimír Mužný

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Understanding database mirroring

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