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Azure SQL vs. Traditional SQL Clusters: Massive Price Differences for Small Databases - Microsoft Trends
In the “old days” (e.g. pre-cloud), the minimum high availability SQL cluster in “Active-Passive” mode. The minimum license for SQL you need is for the active node and is typically charged per processor (unless you have a specific number of users and you buy per CAL). If you need SQL Enterprise, the only available option …