Search notes:

$ORACLE_HOME/bin/orakill

In Windows, orakill can be used to kill a session. The command to be used can be found with the following SQL statement: 
select
   'orakill ' || sys_context('userenv', 'db_name') || ' ' || prc.spid 
from
   v$session ses                          join
   v$process prc on ses.paddr = prc.addr 
where
   ses.sid = …;

See also

alter system kill session.

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