SQL Server is the most commonly brought product with License Mobility to AWS. SQL Server core licenses with active SA or subscription licenses (except those purchased through the Cloud Solution Provider, or CSP, program) are licensed per vCPU on shared-tenancy (default) EC2 instances, with a minimum Microsoft licensing requirement of four vCPUs per EC2 instance. SQL Server/CAL licenses with active SA are licensed with one server license per EC2 instance. Plus, all users or devices with access must have the corresponding CALs assigned to them. SQL Server also has a passive failover benefit with active SA and subscriptions. For every active, licensed SQL Server on EC2, you're eligible for a secondary, passive SQL Server instance on EC2 without having to license the SQL Server portion on the passive instance. For more information, see the Microsoft SQL Server 2022 Licensing guide (downloadable PDF) on the Microsoft website.