Neil Conway <[EMAIL PROTECTED]> writes: > On Tue, 2007-04-10 at 18:28 +0200, Peter Eisentraut wrote: >> The problem is that most of the standard methods are platform dependent, as >> they require MAC addresses or a "good" random source, for instance.
> http://archives.postgresql.org/pgsql-patches/2007-01/msg00392.php > ISTM random() or similar sources is a sufficient PSRNG for the purposes > of UUID generation -- I can't see anything in the RFC that would > contradict that. Doesn't seem like quite enough bits of uniqueness. We could improve matters by incorporating the database's pg_control.system_identifier into the UUID, substituting for the MAC address we don't have a good way to get. system_identifier is currently determined by the system clock at initdb time (to gettimeofday precision), so it would add at least some additional bits of randomness... regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
