Unlock/Lock HR account in Oracle 11g

It is possible that you might forget to unlock the HR account while installation at the Password Management section.

ALTER USER HR ACCOUNT UNLOCK IDENTIFIED BY S0m3P@ssw0rD;

In order to execute this command, the user must have privilege of SYSDBA.

For some reason, if you need to lock the HR account ,

ALTER USER HR ACCOUNT LOCK;

This command will just lock the user, but the data and the password for the account is still valid for use once the account is unlocked by the SYSDBA.