Database
[Definition]:

A database is a collection of data organized to provide efficient retrieval. There are many types of databases in the BI world including relational/RDBMS (where data and the relationships among the data are stored in tables), multidimensional/OLAP (where measures and dimensions comprise a cube structure), ROLAP (Relational OLAP), MOLAP (Multidimensional OLAP), XML and more.

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