CBO가 RBO에 비해서 우수한 이유

예제

create table big_table as
select rownum id, a.*
from all_objects a
where 1=0;

insert into big_table
select rownum id, a.*
from all_objects a
connect by level <= 1000000;

.

.

select t1.object_name, t2.object_name
  from big_table t1, big_table t2
 where t1.id = t2.id
   and t1.owner = 'WMSYS'

CBO

RBO