On 2016-01-05 23:56, Graeme Geldenhuys wrote: > From Wikipedia (GUID vs UUID) > ----------------------------- > The term GUID usually refers to Microsoft's implementation of the > Universally Unique Identifier (UUID) standard.
Reading further on Wikipedia I now understand you get different versions of UUID's. My first set of values were Version 1 (MAC address & date-time) type, and the second set was a Version 4 (Random) set. That explains why they looked so different. > So am I to assume that I will still get unique values even if I generate > 1-2 million records in succession? From the Wikipedia explanation on how Version 1 UUID's are generated I think it is safe to assume that generating 1-2 million UUID's (aka GUID's) is succession should be fine and the likelihood of duplicates are still extremely small. Probability of duplicates (also from Wikipedia) ------------------------------------------------ ...snip... To put these numbers into perspective, the annual risk of a given person being hit by a meteorite is estimated to be one chance in 17 billion, which means the probability is about 0.00000000006 (6 × 10−11), equivalent to the odds of creating a few tens of trillions of UUIDs in a year and having one duplicate. That's odds I'll accept for now. ;-) [Sorry for the mailing list noise. It seems with my own research (after my initial post) I now managed to answered my own question.] Regards, - Graeme - -- fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal http://fpgui.sourceforge.net/ My public PGP key: http://tinyurl.com/graeme-pgp _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
