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)
1
Section 1: Provisioning the SQL Server Environment
4
Section 2: Server and Database Maintenance
9
Section 3: High Availability and the Cloud with SQL Server 2019

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...