What are the types of OLAPs ?

DOLAP: The OLAP tool which words with desktop databases are called as DOLAP. Example: Cognos EP 7 Series and Business Objects, Micro strategy.

ROLAP: The OLAP which works with Relational databases are called as ROLAP. Example: Business Object, Micro strategy, Cognos ReportNet and BRIO.

MOLAP: The OLAP which is responsible for creating multidimensional structures called cubes are called as MOLAP. Example: Cognos ReportNet.

HOLAP: The OLAP which uses the combined features of ROLAP and MOLAP are called as HOLAP. Example Cognos ReportNet.