1. A computer-implemented method for performing customized large-scale data analytics, at least a portion of the method being performed by a computing device comprising at least one processor, the method comprising: providing a logical-data-model user interface to enable modifying a logical data model of a relational multi-dimensional analytic database; receiving, via the logical-data-model user interface, user input to modify the logical data model of the relational multi-dimensional analytic database; modifying the logical data model of the relational multi-dimensional analytic database based on the user input by adding a dimension to the logical data model that corresponds to data stored within the relational multi-dimensional analytic database; providing a visualization user interface to enable performing online analytical processing operations on a multi-dimensional dataset defined by the logical data model, wherein the multi-dimensional dataset defined by the logical data model excludes at least one dimension corresponding to data stored within the relational multi-dimensional analytic database; receiving, via the visualization user interface, a request to perform an online analytical processing operation that provides a view of data stored within the relational multi-dimensional analytic database in accordance with the logical data model.