How Measures stored in columnar view

Hi,

I have question about 'how measures are stored in columnar views'.

For example, underlying replicated database table (generally a row storage) contains data as below -

And a column view (Analytic view) is created using Field1, Field2 and Measure. Therefore the column view will contain Field1, Field2 and aggregated Measure values for Field3.

In report, I can again display aggregated at various levels e.g. sometimes at Field1 level alone, sometimes at Field2 level alone and sometimes displaying Field1 and Field2 both (slicing/dicing).

So, My question is -

1. When an aggregated column is created for Measure, what are the aggregation levels.

2. are various aggregated columns created for Measure for different combinations of levels. In order to get fast result.

Thanks for the reply.

Regards,

Saurabh