https://en.wikipedia.org/wiki/Online_analytical_processing#Multidimensional_OLAP_(MOLAP)
wiki-molap#molap-data-cube1 2Such MOLAP tools generally utilize a pre-calculated data set referred to as a data cube. The data cube contains all the possible answers to a given range of questions. As a result, they have a very fast response to queries. On the other hand, updating can take a long time depending on the degree of pre-computation. wiki-molap#molap-data-cube1 2
wiki-molap#pre-computation-data-explosion1Pre-computation can also lead to what is known as data explosion. wiki-molap#pre-computation-data-explosion1
wiki-molap#molap-automated-computation-of-aggregatesAutomated computation of higher level aggregates of the data. wiki-molap#molap-automated-computation-of-aggregates