cannot kill session

@chk_sess

Oracle 12.1.0.2 SE-2

Oracle Linux 6

This just isn't my day!

The sessions that won't die.  I don't even recall connecting to this database at the time these sessions indicate.  And when I try to kill them ... nada.

SQL> @chk_sessSQL> col username for a10SQL> col osuser for a10SQL> select sid,  2         serial#,  3         username,  4         osuser,  5         status,  6         to_char(logon_time,'dd-mon-yyyy hh24:mi:ss') logon_time  7  from v$session  8  where upper(username)='ESTEVENS'  9  order by username 10  /       SID    SERIAL# USERNAME   OSUSER     STATUS   LOGON_TIME---------- ---------- ---------- ---------- -------- --------------------       199      18081 ESTEVENS              INACTIVE 06-mar-2019 07:33:40       126      61136 ESTEVENS              INACTIVE 06-mar-2019 07:33:40SQL>SQL> alter system kill session '199, 18081' immediate;