Question

Custom aggregation on cube measure

Asked by: priehl

Is it possible to define custom aggregation functions on a measure and implement customized behavior on how it should roll-up? (like maybe implemented within an assembly or some sort of extension)

I have a requirement to calculate IRR from any arbitrary number of dimensions (ie by Country, by Industry, by Company ..any arbitrary combination) for a SSRS report I'm writing

I figure the best aproach for this is to implement a custom aggregation function to allow the cube to handle this rather than myself having to implement it on the report with complicated code and multiple datasets

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Asked On
2009-11-05 at 13:52:52ID24876246
Tags

custom aggregation

,

data warehouse

,

cube

,

IRR

,

measure

Topics

MS SQL Reporting

,

SQL Server 2005

,

OLAP

Participating Experts
1
Points
500
Comments
2

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Answers

 

by: srnarPosted on 2009-11-06 at 04:42:02ID: 25758590

There are two types of measures from this point of view: the materialized where there is a set of build-in aggregation functions (count, sum, max, min, last...) and calculated measures where there is a whole portfolio of other functions calculated on the fly.

I'm not aware of such a possibility to extend the function for materialization of aggregates. The calculated measures can use public methods from .net assemblies what is fine particullary in case of very high number of function calls.

For more follows:
http://technet.microsoft.com/en-us/library/ms175398.aspx

 

by: priehlPosted on 2009-11-09 at 13:06:14ID: 31650763

Thanks for confirming some of the things I've read else where on the feasibility of this approach (specifically it not being possible to create customized materialization routines of aggregates)

Looks like calculated measures are my best bet, even though this would be a compromise.

20120131-EE-VQP-002

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