Je n'avais jamais regardé à quel point l'ordre de grandeur était si fou.

If you were to generate 1 billion UUIDs every second for the next 100 years, the probability of creating just one duplicate would be about 50%. This is of course assuming that the PRNG used in generating the UUID introduced sufficient entropy (“real randomness”) into the mix, otherwise the probability of duplicates count be higher. In a slightly more tangible example, if you were to generate 10,000,000,000,000 [10 trillion] UUIDs, the chance of 2 UUIDs being the same is 0.00000006 %.