Tracking down Oracle Sessions

This query will show the current users and the OS PID…you can use this to then run a top command to watch the session.

ACTIVE users

select s.sid || ',' || s.serial# "SID/SERIAL"
, s.username
, s.osuser
, p.spid "OS PID"
, s.program
, s.status
, s.last_call_et
, sq.physical_read_bytes
, sq.physical_write_bytes
, sq.sql_text
from v$session s LEFT OUTER JOIN v$sql sq ON sq.sql_id = s.sql_id
, v$process p
Where s.paddr = p.addr
and s.status = 'ACTIVE'
and s.osuser <> 'oracle'
order by to_number(p.spid)

ALL Users (except oracle)

select s.sid || ',' || s.serial# "SID/SERIAL"
 , s.username
 , s.osuser
 , p.spid "OS PID"
 , s.program
 , s.status
 , s.last_call_et
 , sq.physical_read_bytes
 , sq.physical_write_bytes
 , sq.sql_text
 from v$session s LEFT OUTER JOIN v$sql sq ON sq.sql_id = s.sql_id
 , v$process p
 Where s.paddr = p.addr
 and s.osuser <> 'oracle'
 order  by to_number(p.spid)

From there you can use the OS PID to run a top command to see what kind of resources the session is consuming

top -p PID

Or you can go the opposite way. Run a top command and then track down the Oracle Sessions using the PID

Find Active Users

select s.sid || ',' || s.serial# "SID/SERIAL"
 , s.username
 , s.osuser
 , p.spid "OS PID"
 , s.program
 , s.status
 , s.last_call_et
 , sq.physical_read_bytes
 , sq.physical_write_bytes
 , sq.sql_text
 from v$session s LEFT OUTER JOIN v$sql sq ON sq.sql_id = s.sql_id
 , v$process p
 Where s.paddr = p.addr
 and p.spid IN (22057, 28919, 21972)
 order  by to_number(p.spid)