Default Measure in SSAS Cubes

When writing MDX it is always a good idea to know what the context which the query executes in is. If we do not explicitly specify a hierarchy member in a tuple SSAS replaces it with the default one, which way more often than not is the All member for dimensions. Because the All member is the default default member, it is easy to think that the default is always the All. This is untrue - the default can be easily changed through BIDS. A sinister (not really, but the word is cool) consequence of this is very apparent when we consider the Measure dimension.