查看dbwr IO负载

select 
     sid, 
     username, 
     round(100 * total_user_io/total_io,2) tot_io_pct 
  from 
  (select 
       b.sid sid, 
       nvl(b.username,p.name) username, 
       sum(value) total_user_io 
   from 
       sys.v_$statname c, 
       sys.v_$sesstat a, 
       sys.v_$session b, 
       sys.v_$bgprocess p 
   where 
        a.statistic#=c.statistic# and 
        p.paddr (+) = b.paddr and 
        b.sid=a.sid and 
        c.name in ('physical reads', 
                   'physical writes', 
                   'physical writes direct', 
                   'physical reads direct', 
                   'physical writes direct (lob)', 
                   'physical reads direct (lob)') 
  group by 
        b.sid, nvl(b.username,p.name)), 
  (select 
        sum(value) total_io 
   from 
        sys.v_$statname c, 
        sys.v_$sesstat a 
   where 
        a.statistic#=c.statistic# and 
        c.name in ('physical reads', 
                   'physical writes', 
                   'physical writes direct', 
                   'physical reads direct', 
                   'physical writes direct (lob)', 
                   'physical reads direct (lob)')) 
  order by 3;