It seems that when you're experiencing a ORA-28001, or if the enterprise manager is unable to connect to the database instance, the probable cause to the issue is that the SYSMAN user password has expired. Not a problem, you an can unlock this user with the example below (in this case, the password for the SYSMAN is 'password')
It's not possible (to my knowledge) to have two triggers on one table that purposely has the same operation.
I was trying to incorporate additional inserts into the table after the data has been imported in another table.
Access the listener.ora file (example vi /home/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora) and
make sure that the lines of code in LISTENER.ORA containing SID_DESC or SID begin with SID_LIST_ on the left side of the equation. Once you've done that,
you can try the restart to then notice that the services become READY