The Business Critical service tier in Azure SQL Managed Instance is a lot more expensive than General Purpose. For the extra money, you get a different architecture.
Is it worth the extra cost? Spoiler: your mileage will vary, but probably not. Let’s talk about why.
I asked a question on Twitter yesterday: “If running SQL Server 2008 in an Azure VM (no SQL upgrade possible, extended support in place), is the best option for high availability Database Mirroring? Or something else I am not thinking of? #sqlhelp”
Microsoft recently updated their policies and recommendations for installing cumulative updates.
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