Check Non-Default Service

1. Log in to Oracle Database 19c as sysdba user.
2. Execute this query to find all the service names with LONG:

   select NAME, NETWORK_NAME, CON_NAME, CLB_GOAL
   from gv$active_services
   where CLB_GOAL='LONG';

3. Check that the non-default service name is not the same as the pdb / cdb name or any sys service name.