Different OS user account details
| User | Description |
| OPC | The system administrator account you use to connect to the compute node using SSH. This user can use the sudo command to perform operations that require root-user access. |
| ORACLE | 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. |
| Grid | The Oracle Grid Infrastructure administrator account you use to perform ASM, ACFS, and clusterware administration tasks. A home directory, /home/grid, 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 – grid command to switch to the grid user. |
| root | 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 user. |