On Sat, Jan 28, 2023 at 8:02 PM Ron <ronljohnsonjr@gmail.com> wrote:
>
> Then it's not a Type 4 UUID, which is perfectly fine; just not random.
Yep, which is why it really should be re-versioned to UUIDv8 to be
pedantic. In everyday use though, almost certainly doesn't matter.
> Also, should now() be replaced by clock_timestamp(), so that it can be
> called multiple times in the same transaction?
Not necessary. Instead of 122 bits of entropy, you get 106 bits of
entropy and a new incremented prefix every minute. now() vs
clock_timestamp() wouldn't make a substantive difference. Should still
be reasonably safe against the birthday paradox for more than a
century when creating more than a million UUIDs per second.