IBM Cognos TM1 Developer's Certification Guide

Virtual cubes

A virtual cube differs from a standard cube in Cognos TM1. It is a TM1 cube which is sometimes termed as a soft cube where no data is loaded to or resides in, but only references data points in other cubes.

Being a fully rules-calculated cube, virtual cubes have no data stored in them. They just have rules pulling data from other cubes and possibly performing additional calculations on that data.

To a TM1 user, a virtual cube may have the exact same appearance of a standard or hard cube. We will discuss the creation and use of a virtual cube in this chapter.

Virtual cube creation

To create a virtual cube, you would first design and create a cube using the methods already discussed for creating a standard cube, but no data would actually ...