Mike Nolan <nolan@gw.tssi.com> writes:
>> You are correct. nextval() is guaranteed never to give the same number
>> (unless setval() were used to reset the sequence value).
> Or unless the sequence wraps around. That's less likely (and less
> dangerous) than having the OID wrap around, but not impossible.
Sequences do not wrap by default (only if you use the CYCLE option).
Anyway, if you use a bigint sequence field you are pretty safe from ever
running out of values...
regards, tom lane
