> We record millions of meetings every week.

My first thought was "why even use big databases, you have perfect workload to shard it between a bunch of instances and as a bonus any downtime would only affect smaller part of customers"

This is not a big database usecase. It just needs one to not do silly things like opening a new database session for every query when it's well documented that this is expensive.

Ha, .net does that automatically unless you really want not to - connection pooling I mean.