Hello alok and welcome to the forums,
I suggest you talk with your security admins or IBM for the steps needed on your system. This would not be material one should get from a forum. . .
If you are interested in learning more about racf, try here:http://www-03.ibm.com/servers/eserver/zseries/zos/racf/
what will be the impact
If not thoroughly
tested in warn mode, this can cause untold grief.