Follow the steps as below to enable EM express for Oracle database,
1. Use sqlplus to connect to the oracle database. Use the following SQL to make sure you are in the root container DB, which should be CDB$ROOT;
SQL>show con_name
2. Check whether EM had already been enabled for HTTPS;
SQL>select dbms_xdb_config.gethttpsport from dual;
If it shows 5500 or whatever other non-zero value, then it means that HTTPs port had already been enabled for EM.
3. Configure HTTPS port for EM if HTTPS is not set yet;
SQL>exec dbms_xdb_config.sethttpsport(5500);
4. Configure HTTP port for EM, just follow the same steps as HTTPs;
SQL>select dbms_xdb_config.gethttpport from dual;
If it shows 8080 or whatever other non-zero value, then it means that HTTP port had already been enabled for EM.Otherwise configure the HTTP port as below,
SQL>exec dbms_xdb_config.sethttpport(8080);
5. Login into EM with the following URLs,
https://your_host_name:5500/em
http://your_host_name:8080/em
