desc emp select distinct job from emp; select * from emp;
select empno, ename, sal from emp where job='CLERK';
create bitmap index emp_job_bitmap_idx on emp(job); col index_name for a24 col index_type for a15 col table_name for a10 select index_name, index_type, table_name, status from user_index where index_name like 'EMP%';
select dbms_metadata.get_ddl('INDEX','EMP_JOB_BITMAP_IDX') from dual;
alter system flush shared_pool; alter system flush buffer_cache;