Database Mirroring = SQL Server 2016 AlwaysON Basic Availability Groups

Database Mirroring was one of the widely used feature since SQL Server 2005 until Microsoft announces Always On availability groups. Database Mirroring feature has been listed as deprecated ever since Availability groups have been introduced from SQL Server 2012.

SQL Server 2016 BOL states

Database Mirroring feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use Always On Availability Groups instead.

What is Basic Availability Groups in SQL Server 2016?

Basic availability groups works like database mirroring to support the database mirroring in SQL Server 2016. Customer’s who use database mirroring then can still setup basic availability groups. Basic availability groups only works for

  • One availability database
  • No read access on secondary replica
  • No backups on secondary replica
  • No availability group listener
  • No support in an existing availability group to add or remove a replica
  • No support for upgrading a basic availability group to an advanced availability group

Despite these limitations, with a basic availability group you get benefits similar to database mirroring in addition to other features. For each replica, you can choose either synchronous-commit or asynchronous-commit mode as similar to database mirroring.

One good thing about this you can see better performance as it uses new transaction log transfer mechanism.

Hope you enjoyed the post!


Ramasankar Molleti

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About Ramasankar

My name is Ramasankar Molleti, and I have been working on various database systems (SQL Server, Oracle, Postgres, DynamoDB, Redshift) over 10 years, primarily focusing on Database Administration, Architect , Development and Business intelligence. I also have working experience on Amazon Web Services DevOps. I hold various Microsoft certifications (Microsoft Certified Information Technology Professional, Microsoft Certified Technology Specialist, and Microsoft Certified Solution Associate). Disclaimer The views expressed on this website/blog are mine alone and do not reflect the views of my company. All postings on this blog are provided “AS IS” with no warranties, and confers no rights. The owner of will not be liable for any errors or omissions in this information nor for the availability of this information. The owner will not be liable for any losses, injuries, or damages from the display or use of this information.
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