d.w...@computer.org (David Wall) writes:
> We're using UUID for primary keys in PG 8.4 without any issues. I
> have no real insights into the details or performance issues, but
> always figured it was stored as a binary 128-bit value, but with added
> benefits of being able to enter and view them using a standard string
> format. We don't sort them as they have no real meaning for us.
In principle, this might be a reason to want to do the long-outstanding
work on hash indexes; with UUIDs, it mayn't be useful to sort the
values, but you *do* want to be able to validate that they're unique.
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