Fact Table design problem

I am having fact table with multiple measures.  Some of these measures are derived from other measures.  The fact data is stored in the lowest level granularity of each dimension.
Sample data is given below:
Fact_Id       Dimension1_key       Dimension2_Key      Measure1      Measure2      Measure3
1            1                  1                  10                  5            20
2            1                  2                  20                  10            40
Here,
“Measure2” derived from “Measure1” as (Measure1/2) (some kind of expression)
And “Measure3” derived from “Measure1” as (Measure1*2) (another kind of expression).

In the system, we need to implement the ability to modify the Measure1 value and verify the impact on other measures (Measure2 and Measure3).  
At any given point of time 5000 (max) such modifications are allowed on Billion row fact table.
In this case what kind of design you guys suggest which will be performant for both transactions and reporting?
BRS_2012Asked:
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Vikas GargAssociate Principal EngineerCommented:
Hi,

My suggestion for the dependent measures is if you are loading the fact table from ETL then add derived column to the ETL and do the calculation for measure2 and 3 over there.

OR
You can also set the computed column in the Fact Table structure what that will do is when any of the fact record will be inserted the rest tow measure columns will be calculated automatically.
SThayaTechnical MAnagerCommented:
Hi,

Doing a calculation for measure2 and 3 in ETL itself is a best choice.because this will not  affect the Qube performance,

in case , if you want to create a additional measures from the existing measure use the "Calculated Members " in Qube itself.

Please refer the below link for creating calculated measures through MDX  or Qube itself

https://msdn.microsoft.com/en-us/library/ms166568.aspx

Using Mdx:

http://docs.intersystems.com/ens20152/csp/docbook/DocBook.UI.Page.cls?KEY=D2GMDX_ch_calculated_members

http://www.purplefrogsystems.com/blog/2011/01/how-to-add-calculations-in-ssas-cubes/

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