How much headroom should I leave for my OS? (Debian 9.5 minimal x64) e.g. would I be able to give the server 3GB on a 4GB VPS (KVM, no swap) or would it be best to go more conservative at 2.5GB? Second question is should I be using MySQL (would use MariaDB in my case) when plugins like Coreprotect and dynmap call for it? Is there a good reason to set this up instead of letting them use their default sqlite? I'm running a single survival server, thanks.