In Oracle, it's not possible to create a uniquebitmap index. When trying to do so, Oracle throws an ORA-00968:
drop table tq84_uniq_bmp;
create table tq84_uniq_bmp (
id number,
val varchar2(10)
);
--
-- Following statement throws error:
--
create unique bitmap index tq84_uniq_bmp_ix on tq84_uniq_bmp(id);
drop table tq84_uniq_bmp;