Always On Availability Groups
Always On Availability Groups is a high-availability and disaster recovery solution in Microsoft SQL Server that provides database-level failover for groups of databases. It allows multiple copies of a set of databases (availability replicas) to be maintained across different servers, ensuring data redundancy and automatic failover in case of primary server failure. This feature supports both synchronous and asynchronous data replication modes to balance performance and data protection needs.
Developers should learn Always On Availability Groups when building mission-critical applications requiring high availability, minimal downtime, and data protection for SQL Server databases, such as in financial services, e-commerce, or healthcare systems. It is essential for scenarios where automatic failover, read-scale workloads, and geographic redundancy are needed, as it ensures application continuity and data integrity during server outages or maintenance.