What is always on availability groups?

Question

AlwaysOn Availability Groups (AAG) provide high availability and disaster recovery at SQL database level. Data Protection for SQL Server protects availability databases in both AlwaysOn failover cluster instances and in an AAG. An AlwaysOn node manages backups of availability databases.

What is the purpose of AlwaysOn availability groups?

Always On availability groups provide high availability, disaster recovery, and read-scale balancing. These availability groups require a cluster manager. In Windows, the failover clustering feature provides the cluster manager. In Linux, you can use Pacemaker.

What is AlwaysOn SQL Server?

The Always On availability groups feature is a high-availability and disaster-recovery solution that provides an enterprise-level alternative to database mirroring. Introduced in SQL Server 2012 (11. x), Always On availability groups maximizes the availability of a set of user databases for an enterprise.

What is availability mode in always on?

In Always On availability groups, the availability mode is a replica property that determines whether a given availability replica can run in synchronous-commit mode.

What is distributed Always On availability Group?

A distributed availability group is a special type of availability group that spans two separate availability groups. The availability groups that participate in a distributed availability group do not need to be in the same location.

Expert · Answer