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Microsoft SQL Server 2014 Unleashed by Paul Bertucci, Alex T. Silverstein, Chris Gallelli, Ray Rankins

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AlwaysOn Availability Groups

Figure 45.1 also shows the availability group capability. Availability groups are focused on database-level failover and availability by utilizing a data redundancy approach. Again, borrowing from the database mirroring experience (and underlying technologies), a transactionally consistent secondary replica is made that can be used for both read-only access (active for use at all times) and for failover if the primary database (primary replica) fails for any reason. In Figure 45.1, you can see a SQL Server AlwaysOn Availability Group being used for HA and even for distributing the read-only workload off of the primary SQL Server instance to the secondary replica. You can have up to four secondary replicas in an availability ...

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