Disconnect Blocking Sessions

Before you upgrade, check for and stop any current database sessions.

1. If WebLogic Server is running, stop it. See Oracle® Fusion Middleware Administering Server Startup and Shutdown for Oracle WebLogic Server (12.2.1.4) at https://docs.oracle.com/en/middleware/fusion-middleware/12.2.1.4/asadm/starting-and-stopping.html#GUID-B57BE53D-F90C-42FB-9B73-27A06AE3768B.
   Log files for the AdminServer and the DMWServer are located in:

   middleware_home/user_projects/domains/DMWDomain/servers/AdminServer/logs

   and

   middleware_home/user_projects/domains/DMWDomain/servers/DMWServer/logs

2. Log in to SQL*Plus as apps.
3. Run the following query to find current sessions:

   SELECT 'USER: '||s.username||' SID: '||s.sid||' SERIAL #: '||S.SERIAL# "USER 
   HOLDING LOCK", s.inst_id 
   FROM gv$lock l 
   ,dba_objects o 
   ,gv$session s 
   WHERE l.id1 = o.object_id 
   AND s.sid = l.sid 
   AND o.owner = 'CDR' 
   AND o.object_name = 'DME_DISC_WORKTABLIST'; 

   This query returns the user, SID, serial number, and instance ID of each current session.
4. Disconnect each current session, passing in the SID and serial number:

   alter system disconnect session 'SID, serial_number' IMMEDIATE