My alert log file entries:
Current log# 3 seq# 4645 mem# 0: <DATAFILE_LOCATION>/redo03.log Wed May 21 21:19:53 2014 WARNING: Detected too many memory locking problems. WARNING: Performance degradation may occur.
The real cause of those warnings is the file oradism located on $ORACLE_HOME/bin folder was lacking permission.
As per meta link note 374367.1, issuing the following command should stop the warnings to get generated:
1- cd $ORACLE_HOME/bin
2- chmod 4550 oradism 3- chmod g+s oradism 4- chown root:dba oradism 5- Bounce the database