2 gig limitation?

i've noticed that one of our databases looks a bit strange:

-rw------- 1 pgsql pgsql 2147483648 Apr 28 23:06 gt
-rw------- 1 pgsql pgsql 171073536 Apr 29 08:28 gt.1

is there some strange thing that happens when a database exceeds 2 gig in size?

i have a nightly process which selects the previous 30 days data into a
new table, then does a:
alter table rename gt to gt_old;
alter table rename gt_new to gt;
create unique index gt_index on some_field;

the create index failed.

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