so.. with type 1 UUIDs with the mac address/timestamp you can generate 10,000 globally (providing you dont duplicate your mac address) unique ids per millisecon

so.. with type 1 UUIDs with the mac address/timestamp you can generate 10,000 globally (providing you dont duplicate your mac address) unique ids per millisecond per system without conflict. With type 4 if just going random the chance of a collision is somewhere up there with having two of your data centers simultaneously hit with a meteorite (providing numbers are random) - although I suppose this would be useful if you are on a limited embedded system or something with no RTC or mechanism to generate static/random data and timestamps and random number generation is very unreliable. I assume this is a joke?