Solving connection errors with Oracle Database and SQL Developer

Do you have problems connecting with Oracle Database? Do you want to stop/start the services? To find out more about my Oracle SQL Udemy course, please go to: https://idodata.com/1z0-171-oracle-sq... ---- In this video, we will look at the following error messages: Vendor code 17002: IO Error: The Network Adapter could not establish the connection. ORA-12514, TNS:listener does not currently know of service required in connect descriptor We will look at: lsnrctl status and lsnrctl start We will open the Services, and stop and start the listener and the service.