Chapter 4
AlwaysOn Availability Group
Section 2
AlwaysOn Availability Group Concepts and Terminology
An AlwaysOn availability group is a group of databases that can fail over from a primary server to a secondary server automatically or manually, as and when required. Commonly known as AlwaysOn AGs, they're the premium high availability and disaster recovery solution available in SQL Server. In this section you will also learn about the various Availability Groups, Automatic and Manual Failover, then we will have a look at the different health check timeout threshold and lastly all the five failure condition levels that specify the condition that will cause the automatic failover.