oracle11g database user password expires how to change the password

1. Log in to the Oracle database as an administrator . Open the command prompt and enter the following command: 
   ``` sqlplus sys as sysdba 
   ``` Enter the administrator password to log in . 
2. Unlock the user account and change the password. 
   Assuming that the user name you want to change is `example_user`, you can use the following commands to unlock the account and update the password: 
   ``` ALTER USER example_user ACCOUNT UNLOCK; 
   ALTER USER example_user IDENTIFIED BY new_password; 
   ``` 
   Replace `example_user` with the actual user name, replace `new_password` with the new password you want to set. 
3. Verify the new password. 
   Log in to the database with the changed username and password to verify that the new password takes effect. 
   ``` 
   sqlplus example_user/new_password 
   ``` 
   If the login is successful, the password has been successfully changed. 
Note that it is important to properly secure and protect database credentials to ensure the security and integrity of your data. If possible, use strong passwords, change passwords regularly, and limit access to sensitive data.