Figured this out. This was a silly mistake. I was trying to solve the issue of RBAC table assignment after uploading to a linux server, and did that wrong. This is the correct way.
//In config/main.php
'authManager'=>array(
'class'=>'CDbAuthManager',
'connectionID'=>'db',
'assignmentTable'=>'authassignment',
'itemTable'=>'authitem',
'itemChildTable'=>'authitemchild',
),