ADD MLOCK privilege to Oracle group:

MLOCK Privilege

To allow Oracle11g to execute asynchronous I/O operations, the group that the Oracle software owner belongs to (dba) must have the MLOCK privilege. To give the dba group the MLOCK privilege:

As the root user, enter the following command:

# setprivgrp dba MLOCK

To retain the MLOCK privilege after rebooting, create the /etc/privgroup file, if it does not exist on your system, and add the following line to it:

dba MLOCK