create table t
as
select * from all_objects
order by object_id;  --> Å×ÀÌºí ·¹Äڵ尡 object_id ¼øÀ¸·Î ÀԷµǵµ·Ï ÇÔ

create index t_object_id_idx on t(object_id);

create index t_object_name_idx on t(object_name);

exec dbms_stats.gather_table_stats(user, 'T');   -- Åë°èÁ¤º¸ ¼öÁý

select i.index_name, t.blocks table_blocks, i.num_rows, i.clustering_factor
from   user_tables t, user_indexes i
where  t.table_name = 'T'
and    i.table_name = t.table_name;

select /*+ index(t t_object_id_idx) */ count(*) from t
where  object_name >= ' '
and    object_id >= 0;

select /*+ index(t t_object_name_idx ) */ count(*) from t
where  object_name >= ' '
and    object_id >= 0;