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Try to wrap your head around this sense of scale

A nanosecond is one billionth of a second.  I.e. every second there are a billion nanoseconds.

A UUID (Universally Unique Identifier) is a 16-byte number used in software.  The number of combinations is 2128 = 25616 or about 3.4 × 1038.

Just how big is 3.4 × 1038?

To exhaust all UUIDs you would have to create one trillion every nanosecond...

...for 10 billion years.

Posted on Friday, June 29, 2007 9:10 AM Architecture | Back to top


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