Eventually yes you would get an overflow around the 2.1 billion point. I'm not sure it will cause the server to crash but I suspect mysql wont be happy about it. You can probably write a script to re-index the server every time you take it down for maintenance (in fact that sounds like an overall good idea)... but...
If you're using a global every second in combat perhaps that isn't the best course of action either. Remember that every time you create/delete a global there's a DB hit so perhaps there's another way to do what you want to accomplish.
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