Command to find the top unix processes doing high disk read and writes

Question

I would like to know 'the unix command to find the top unix processes doing high disk reads or/and writes
If any one knows the solution please help me?
-Swamy

Answer 1

From the oracle side you can obtain OS process id for sessions having some waits for user I/O
select p.spid, s.sid, s.sql_id
from v$session s, v$process p
where s.paddr=p.addr
and s.sid in
select sid from v$session_wait
where wait_class='User I/O'
);and to see sessions that are currently waiting on user I/O use
select p.spid, s.sid, s.sql_id
from v$session s, v$process p
where s.paddr=p.addr
and s.sid in
select sid from v$session_wait
where wait_class='User I/O'
and wait_time=0
);HTH, Peter