Always On Availability Groups (AG) is the modern, enterprise-level evolution of Database Mirroring (DBM). While Database Mirroring has been officially deprecated by Microsoft since SQL Server 2012, Always On AG serves as its direct, feature-rich replacement. Quick Comparison Overview
The core difference is that Mirroring operates strictly on a single-database level, whereas Availability Groups allow you to group multiple databases together so they fail over simultaneously. sql server – I’m confused about High Availability/Always On
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