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MDC organization on disk<br />
Example: MDC with three axes (AKA dimensions), nation,<br />
year, category, each with values 1, 2, 3, 4.<br />
Let C123 stand for cell with axis values (1,2,3), I.e., nation =<br />
1, year = 2, category = 3<br />
On disk, each block (1 MB say) belongs to a cell.<br />
The sequence of blocks on disk is disordered:<br />
C321 C411 C342 C433 C412 C143 C411 C231 C112 …<br />
One cell, say C411, (nation = 4, year = 1, category = 1) has<br />
several blocks,in different places, but since each block is 1<br />
MB, it’s worth a seek.
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