Preventing a CT to take down the whole system

Greetings

I have a CT with a MariaDB inside it; I noticed that when a very heavy sql-related load occurs, the whole host system becomes unresponsive for an extended period of time: I cannot even use an already established ssh connection.

Is there a way to "contain" a CT so I can at least keep my host ssh connection alive?

Thanks in advance

Regards

GR