How to log in to the Oracle database?

To log in to the Oracle database, you can follow these steps:

1. Open the command line window.
2. Enter the following command to log in to the Oracle database:

sqlplus username/password@hostname:port/service_name

In this case, ‘username’ is your database username, ‘password’ is your database password, ‘hostname’ is the host name or IP address where the database is located, ‘port’ is the port number the database is listening on, and ‘service_name’ is the service name of the database. If logging into a local database, you can omit the hostname:port/service_name part.

1. Press the enter key to execute the command.
2. If the username and password are correct, you will successfully log in to the Oracle database and see a prompt, such as SQL>.

Before using the above command to log in to the Oracle database, make sure that Oracle database has been correctly installed and configured, and that the database service is running.