Restricted DBC database views can be created to limit access to information. Restricted DBC views are identified by the suffix X and called X views.
Teradata Visual Explain uses restricted views to limit access to those plans owned (Data Dictionary and QCD data) by the users currently logged on.
Beginning with Teradata Database 12.00.00, each system view in the DBC database includes a view that supports Unicode®. All Unicode® system views are identified by a suffix, V or VX, when a restricted Unicode® view is used.