UUID Vs Primary Key
I was not aware of uuid so i searched on google about uuid and i found an intersting quote from wikipedia
".. after generating 1 billion UUIDs every second for the next 100 years, the probability of creating just one duplicate would be about 50%."
I read since it is based on timestamp ,hence it is almost impossible to generate duplicate uuid, then i thought if it really so , then why i don't know about uuid till now? I don't even read about it in my engineering books . Why we don't use it as it can reduce many concurrency problems in database ?
If anyone knows about it then please share