How can we know that size of dimension is more than fact table?

how can we know that size of dimension is more than fact table?
this was the question asked for me in interview

Hi Reddy,
  This is common way finding the size of cube or dimensions or KF.
Each keyfiure occupies 10 Bytes of memory
Each Char occupies 6 Bytes of memory
So in an Infocube the maximum number of fields are 256 out of which 233 keyfigure, 16 Dimesions and 6 special char.
So The maximum capacity of a cube
= 233(Key figure)10 + 16(Characteristics)6 + 6(Sp.Char)*6
In general InfoCube size should not exceed 100 GB of data
Hope it answer your question.
Regards,
Varun

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