Explanation/Reference:
Explanation:
Oracle is the Oracle Database administrator account you use to access the system and perform non-root database administration tasks. A home directory, /home/oracle, is created for this user. This user cannot use the sudo command to perform operations that require root-user access. Additionally, by default you cannot connect as this user to the compute node using SSH. You can add the public key to the user's
$HOME/.ssh/authorized_keys file to grant persistent SSH access, or you can connect as the opc user and then use the sudo -s command to start a root-user command shell, followed by an su - oracle command to switch to the oracle user.
Incorrect Answers:
F: root is the root administrator for the system. You do not have direct access to this account. To perform operations that require root-user access, use the sudo command as the opc, not the oracle, user.
References: https://docs.oracle.com/en/cloud/paas/database-dbaas-cloud/csdbi/linux-user-accounts- rac.html
http://www.oracle.com/webfolder/technetwork/tutorials/obe/cloud/dbaas/
obe_dbaas_administering_your_database_cloud_service/
obe_dbaas_administering_your_database_cloud_service.html