If you host a DayZ/Epoch server, its a pain to wait until players are offline to make server edits or add scripts. The alternative chosen is often to pay for a second server just for testing. Well, you already have most of the stuff required to run a server on your own local PC .. and its not that hard.
You dont NEED to download MySQL Server 5.7 .. its included in our download.
You DO need to download MySQL Workbench unless you have some other local client application.
You DO need to download the server files for whichever mod you like