I have a cube which has been processing for over 4 hours now. It gets
the data from a view, but the amount of data in the database isn't
enormous - the largest table is around 500k rows. So far I'm stuck on:

Processing Partition '(view name)' - ReadData 662060000.

What exactly is the ReadData part? Number of rows read, or does it
equate to something else? 662 million seems quite a hefty figure and I
don't want new data updates taking 4 hours at a time.