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Online analytical processing
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==== Horizontal partitioning ==== In this mode HOLAP stores some slice of data, usually the more recent one (i.e. sliced by Time dimension) in [[#Multidimensional_OLAP_.28MOLAP.29|MOLAP]] for fast query performance, and older data in [[#Relational_OLAP_.28ROLAP.29|ROLAP]]. Moreover, we can store some dices in [[#Multidimensional_OLAP_.28MOLAP.29|MOLAP]] and others in [[#Relational_OLAP_.28ROLAP.29|ROLAP]], leveraging the fact that in a large cuboid, there will be dense and sparse subregions.<ref>{{cite journal|arxiv=cs/0702143|doi=10.1016/j.ins.2005.09.005 |title=Attribute value reordering for efficient hybrid OLAP |year=2006 |last1=Kaser |first1=Owen |last2=Lemire |first2=Daniel |journal=Information Sciences |volume=176 |issue=16 |pages=2304β2336 }}</ref>
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