What is the difference between OLAP, ROLAP, MOLAP and HOLAP?

ROLAP, MOLAP and HOLAP are specialized OLAP (Online Analytical Analysis) applications. ROLAP stands for Relational OLAP. Users see their data organized in cubes with dimensions, but the data is really stored in a Relational Database (RDBMS) like Oracle.

The RDBMS will store data at a fine grain level, response times are usually slow. MOLAP stands for Multidimensional OLAP. Users see their data organized in cubes with dimensions, but the data is store in a Multi-dimensional database (MDBMS) like Oracle Express Server.

In a MOLAP system lot of queries have a finite answer and performance is usually critical and fast. HOLAP stands for Hybrid OLAP, it is a combination of both worlds. Seagate Software's Holos is an example HOLAP environment.

In a HOLAP system one will find queries on aggregated data as well as on detailed data. More.

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