如何在mysql中永久激活/设置全局event_scheduler为1

I have added a event to my mySQL db and it works fine, but the thing that is bothering me is that every now and then I have to set the mysql global variable to 1 so that my event is active.I log in as root user and have complete privileges (I use it for practice purpose) I have added a event to my mySQL db and it work