Манул к какой БД ? В самом мануале что было написано-то ?
Гуглили ?

http://cat.inist.fr/?aModele=afficheN&cpsidt=14404659:
Abstract
Only few multidimensional access methods have made their way into commercial relational DBMS. Even if a RDBMS ships with a multidimensional index, the multi-dimensional index usually is an add-on like Oracle SDO, which is not integrated into the SQL interpreter, query processor and query optimizer of the DBMS kernel. Our demonstration shows TransBase HyperCube, a commercial RDBMS, whose kernel fully integrates the UB-Tree, a multidimensional extension of the B-Tree. This integration was performed in an ESPRIT project funded by the European Commission. We put the main emphasis of our demonstration on the application of UB-Tree indexes in real-world databases for OLAP. However, we also address general issues of UB-Trees like creation, space-requirements, or comparison to other indexing methods.