Comparing SQL Server AlwaysOn Availability Groups (AGs) and Basic Availability Groups (BAGs): Cost and Features
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AlwaysOn Basic Availability Groups (BAG) supported in SQL Server Standard Edition and AlwaysOn Availability Groups (AG) introduced in SQL Server Enterprise Edition were designed to create a replicated environment with improved failover capabilities. However, the two types provide different capabilities while also requiring different licensing costs.
Read the full article by Shashank Singh, Microsoft MVP, and SQL Server Architect to learn more about BAG and AG cost and functionality differences.
