On 2011-01-05, Scott Ribe <scott_r...@elevated-dev.com> wrote: > On Jan 5, 2011, at 9:01 AM, Tom Lane wrote: > >> In practical use I think the odds of a collision are *far* higher than >> you are suggesting, unless the UUID generation is being done with a lot >> more care than is likely if the user takes these sorts of claims at face >> value. > > Eh? The user taking such claims at face value has no bearing whatsoever on > the quality of the UUID generation algorithm provided by the OS. So, unless > we're talking about users coming up with their own algorithms, it seems > reasonable to assume that the generation is done with a great deal of care. > (And if we are talking about users coming up with their own algorithms, then > all bets are off; feel free to assume the worst.) I know that is the case on > OS X & Linux. I would be shocked if it were not the case on Solaris. I would > even be surprised if it were not the case on Windows.
> The IETF Network Working Group designed UUIDs to ensure that their > uniqueness guarantee would be strong enough that no application would > need to worry about duplicates, ever. Claims that collisions are too > likely to depend on UUIDs being unique really are claims that the IETF > Network Working Group didn't know what it was doing, which I find a > bit ridiculous. Who was it that decided on 32 bits for IP addresses? -- ⚂⚃ 100% natural -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
