Out of Band Interactions with MySQL

I sometimes use these cheatsheets by pentestmonkey, and I noticed that it said it isn't possible to make DNS requests with MySQL with a "?". DNS requests are used in OAST (Out-of-band Application Security Testing) techniques to infer that an application is vulnerable to SQL injection when other methods fail. Or more simply, if we can make a server perform DNS lookups we have at least some element…