I get many inquiries on the differences and pros and cons of MOLAP vs. ROLAP architectures for analytics and BI.

In the old days the differences between MOLAP, DOLAP, HOLAP and ROLAP were pretty clear. Today, given the modern scalability requirements, DOLAP has all but disappeared, and the lines between MOLAP, ROLAP and HOLAP are getting murkier and murkier. Here are some of the reasons:

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