On Fri, 2007-01-19 at 23:00 -0500, Tom Lane wrote:
> Per previous discussion, the main problem with a uuid type is the
> new-uuid generator function, which tends to involve a bunch of
> not-so-portable assumptions and code.

RFC 4122 specifies several ways of generating UUIDs:

* via the computer's MAC address and the time since the Gregorian epoch
in nanoseconds

* via MD5 or SHA1 hashing of a given string of URL, or similar
identifier

* via a PSRNG

Only the first of these presents any portability concerns, AFAICS.

-Neil



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