Standard Edition only allows Always On setup in basic mode. Switch to Enterprise Edition for full Always On features.

Always On Basic Mode (Standard Edition) Limitations

Basic availability groups use a subset of features compared to advanced availability groups on SQL Server Enterprise Edition. Basic availability groups include the following limitations:

  • Limit of two replicas (primary and secondary). Basic Availability Groups for SQL Server 2017 on Linux support an additional configuration only replica.
  • No read access on secondary replica.
  • No backups on secondary replica.
  • No integrity checks on secondary replicas.
  • No support for replicas hosted on servers running a version of SQL Server prior to SQL Server 2016 Community Technology Preview 3 (CTP3).
  • Support for one availability database. For multiple databases, you have to setup multiple AG groups.
  • Basic availability groups cannot be upgraded to advanced availability groups. The group must be dropped and re-added to a group that contains servers running only SQL Server 2016 Enterprise Edition.
  • Basic availability groups are only supported for Standard Edition servers.
  • Basic availability groups cannot be part of a distributed availability group.
  • You may have multiple Basic availability groups connected to a single instance of SQL Server.


Last modified: February 27, 2023



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