I occasionally see blogs shared here go down with an error message "Error establishing a database connection". I guess they are WordPress sites with too much da

I occasionally see blogs shared here go down with an error message "Error establishing a database connection". I guess they are WordPress sites with too much database connection within a timeframe. I talked about (Phoenix/TS) LiveView with a friend recently. His immediate response is it sounds "not scalable" because "the server is not abusing the clients as slave". I want to see how many clients could a single node serve without any tricks on clustering, load balancing, e.t.c.