MDAC 2.5 SDK - OLE DB Programmer's Reference
Chapter 23: Rowsets in OLE DB for OLAP
Based on the following conditions, the data source property MDPROP_RANGEROWSET returns information about whether or not the provider supports updating of cells through the IMDRangeRowset interface:
Consumers should not use the range rowset purely to fetch cell data (even though it is possible to do it). The IMDDataset::GetCellData method is better optimized for the typical navigation requirements of an OLAP application. Moreover, because the range rowset might have to support the update interfaces, it might not be as efficient as fetching cell data by using IMDDataset::GetCellData.