[Freeswitch-users] UUID - how unique is it?

[Seven Du]

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


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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 at telecube.com.au (mailto:john at 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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> > 
> > 
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> 
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