1.diff between drill down and drill through?2. what is meant by roll-up?3.what is meant by external roll-up?how to create external rollup with example?4.what is meant by clean house command?5.what is meant by scope?what are types?explain them6.what is meant by cube groups?how to create cube groups?there is any simplest way to create cube groups?7.what is meant by alternate drill down with ex?8.how many cubes you are created till now?9.what is the size of the present cube?10.why you choose Ex-files and flatfiles instead of iqd?11.what is meant by partition?How To create?12.how to create time state Partition13.model contain ____________? cube contai___________?14.what is distinct measure?