I had looked this on wikipedia a few days ago, it said -

In other words, only after generating 1 billion UUIDs every second for the next 100 years, the probability of creating just one duplicate would be about 50%.


http://zh.wikipedia.org/wiki/UUID

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On Tuesday, May 21, 2013 at 11:16 AM, Telecube - John wrote:

+rep

I like this answer

:-)

- John
On 21/05/13 12:58 PM, Gabriel Gunderson wrote:
On Sun, May 19, 2013 at 7:57 AM, Telecube - John <john@telecube.com.au> wrote:
Can I count on uuid to be totally unique in my billing records?
Just for fun...

Number of stars believed to exist in known universe:
70,000,000,000,000,000,000,000

Number of *drops* of water estimated to be the world's oceans (U.S. Navy):
222,000,000,000,000,000,000,000,000

Number of *unique* UUIDs:
340,282,366,920,938,463,463,374,607,431,768,211,456

So, your chances of a collision with *hundreds* of *billions* of truly
random UUIDs is inconceivably low.

The only thing you really have to worry about are humans and the code
they write ;)


Best,
Gabe

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