Oracle 10g Killing open sesions

We have a client program that leaves lots of open sessions. These sessions take up server resources and we wanted to find a way to locate and kill them.

Thanks to Natasa Oikonomidou from Softworks who provided the code, I ended up with the following solution:

Create a the following procedure on the sys schema.

create or replace
PROCEDURE inactive_session_killer
IS
  now DATE;
BEGIN
  now := sysdate;
  FOR rec IN
    (SELECT sid,
       serial#,
       username,
       schemaname,
       osuser,
       terminal,
       machine,
       PROGRAM,
       status,
       type,
       saddr,
       logon_time,
       now - last_call_et / 86400 last_activity
     FROM v$session
     WHERE username = 'XXXXX'   -- user name of open session "leaver"
           AND type = 'USER')
  LOOP

    IF rec.last_activity <( now  - 8 / 24) THEN
      -- inactive for more than 8 hours
      -- you can keep a log table here: inserrt into ...
      EXECUTE IMMEDIATE 'alter system kill session ''' ||  
                                        rec.sid || ',' || 
                                        rec.serial#    || 
                                        ''' immediate';

    END IF;

  END LOOP;
END;

Using SQLPlus or SQL Developer execute the following

 
VARIABLE jobno number;
BEGIN
   DBMS_JOB.SUBMIT(:jobno, 'inactive_session_killer;', SYSDATE, 'SYSDATE + 1/24');    -- runs every hour
   commit;
END;

... and that does it.