using scope with calculated member - ssas

Question

I have problem in my calculated member. Whenever this member involve in calculation or query it take large time to execute. I am trying to narrow down execution time.
I have to remove IIF condition from the members and start using scope instead.
CREATE Member CurrentCube.[Measures].[AvgAmount] as
IIF(ISLeaf([Customer].[ParentCustomer].currentmember),
[Measures].[Value],
(SUM([CCube^Customer].[ParentCustomer].CURRENTMEMBER.CHILDREN) /
COUNT([Customer].[ParentCustomer].CURRENTMEMBER.CHILDREN))
) ,
Format_String = "#.0000000;-#.0000000;0;0",
Non_Empty_Behavior = [Measures].[Amout];
I have created hierarchy of customer which is [ParentCustomer] here. I want to see avg amount of all the children under the parent customer but when I am looking child level which does not have any children in it should only show the [Measures].[Amout].
Thanks in advance
Regards,
Sam

Answer 1

From your question, I assume you really want to have the average of the children, and not the average of all leaf level descendants. The latter could be implemented as follows:
Create a new measure group on the customer dimension table which has a single measure 'customer count' which would just be implemented as count - or of your customer dimension as a granularity that is finer than a single customer - countdistinct of the customer key or something like this.
Then just define your measure as
CREATE Member CurrentCube.[Measures].[AvgAmount] as
[Measures].[Value] / [Measures].[customer count],
Format_String = "#.0000000;-#.0000000;0;0",
Non_Empty_Behavior = [Measures].[Amout];
This assumes that the aggregation of [Measures].[Value] is defined as sum or one of the semi additive aggregations, but not max or min or something similar.
However, I assume from your question that this is not what you want. Instead you want to see the average of the children at each level. And I assume that [Customer].[ParentCustomer] is a standard user hierarchy and not a parent child hierarchy. Then, the approach suggested in the title, using SCOPE, would work. Let's assume you have three levels in your [Customer].[ParentCustomer] hierarchy:
The (implicitly defined) All level, just containing the All member
level A, built from attribute A of the dimension
level B, which is the leaf level and built from attribute B of the dimension
Then, under similar assumptions about the [Measures].[Value] aggregation, you could define the AvgAmount measure as follows:
// create the measure as it is correct for level B:
CREATE Member CurrentCube.[Measures].[AvgAmount] as
[Measures].[Value],
Format_String = "#.0000000;-#.0000000;0;0",
Non_Empty_Behavior = [Measures].[Amout];
// overwrite the definition for level A:
SCOPE([Customer].[ParentCustomer].[A].Members);
[Measures].[AvgAmount] = [Measures].[Value] / (EXISTING [Customer].[B].[B].Members).Count
END SCOPE;
// overwrite the definition for the ALl level:
SCOPE([Customer].[ParentCustomer].&[All]);
[Measures].[AvgAmount] = [Measures].[Value] / (EXISTING [Customer].[A].[A].Members).Count
END SCOPE;
This approach, using SCOPE, would not work for a parent child hierarchy, buta syou do not write you have one, I just assume you don`t.