Why no results were listed after the DMV query?

Hi,

I run the following DMV query, but nothing were listed after the DMV query.

SELECT [CATALOG_NAME]as [DATABASE],CUBE_NAMEAS [CUBE],[DIMENSION_UNIQUE_NAME]AS [DIMENSION],HIERARCHY_CAPTIONAS [DIMENSION ATTRIBUTE],HIERARCHY_IS_VISIBLEAS [VISIBLE]

FROM $system.MDSchema_hierarchies

WHERECUBE_NAME  ='CubeName'AND HIERARCHY_ORIGIN=2

ORDERBY [DIMENSION_UNIQUE_NAME]

If you know the reason, Please let me know. Really Appreciate!