Re: How to best grab a chunk of Ids from a sequence

"Bryan White" <bryan(at)arcamax(dot)com> writes:
> My question is is there a way to grab 4 million IDs from a sequence without
> calling nextval once for each ID. Note, this sequence is being actively
> drawn on by other processes.

I can't think of any really clean way, but you could do something like

select setval('seq', nextval('seq') + 4000000 + 100);

and then use the 4m IDs just before the returned value. Because the
nextval and setval aren't an atomic operation, it's possible that
some other processes will get in and do nextval in between. The extra
100 advance of the sequence should provide an adequate buffer for that
... but of course it could theoretically be insufficient...

regards, tom lane