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 -- Seven Du http://www.freeswitch.org.cn http://about.me/dujinfang http://www.dujinfang.com Sent with Sparrow (http://www.sparrowmailapp.com/?sig) 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 (mailto: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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