There are three standard storage modes (MOLAP, ROLAP and HOLAP) Advantages & Dis-advantages of MOLAP, ROLAP and HOLAP In the OLAP world, there are mainly two different types : Multidimensional OLAP ( MOLAP ) and Relational OLAP ( ROLAP ). Hybrid OLAP ( HOLAP ) refers to technologies that combine MOLAP and ROLAP. MOLAP Excellent performance- this is the more traditional way of OLAP analysis. In MOLAP, data is stored in a multidimensional cube. The storage is not in the relational database, but in proprietary formats. Advantages: MOLAP cubes are built for fast data retrieval, and are optimal for slicing and dicing operations. They can also perform complex calculations. All calculations have been pre-generated when the cube is created. Hence, complex calculations are not only doable, but they return quickly. Disadvantages: It is limited in the amount of data it can handle. Because all calculations are performed when the cube is built, it is not possible to include a large amou...
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