Experience the Possibilities with Oracle 10g Express Edition - Using the sample database (
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Oracle 10g XE comes with a sample database called HR which stands for human resources. However, this database is locked when installed. You need to unlock it before you can use it. Click on Administration, then click on the HR icon. The first click opens the following screen.

The second click on the HR icon opens the screen as shown here. Enter hr for both username and password and make sure the unlocked choice is showing on this screen for Account Status. Make sure that both Connect and Resource are checked for the "Roles" before you click on the Alter User button which makes the requested changes to the User. Now you are rocking! You will be able to access the HR database.
