select c.* from
    (select disk_reads,
            buffer_gets,
            rows_processed,
            executions,
--	    address,
--  	    hash_value,
            first_load_time,
            sql_text
       from v$sqlarea
       where parsing_user_id !=0
       order by
          buffer_gets/decode(executions,null,1,0,1,executions) desc ) c
where rownum < 5;