Identify long running session and kill it

Sometimes you can find an Oracle database session that has been running for very long time. You can find it with this query:

select s.username,s.sid,s.serial#,s.last_call_et/60 mins_running,q.sql_text from v$session s 
join v$sqltext_with_newlines q
on s.sql_address = q.address
 where status='ACTIVE'
and type <>'BACKGROUND'
and last_call_et> 60
order by sid,serial#,q.piece

Then you can kill it with (change sid and serial# using result from query above):

ALTER SYSTEM KILL SESSION 'sid,serial#';