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Posts Tagged "Duplicate Key"

Part 2 – Analysis Services Multidimensional: “A duplicate attribute key has been found when processing”

Introduction – Part 2

Part 1 of this post focused on the first category of how the Analysis Services Multidimensional (MD) duplicate attribute key error can arise. It reflects the perspective of an atomic attribute – an attribute having no attribute relationships other than with the dimension key attribute.
This post focuses on the second category of this error, which can arise when an attribute does have attribute relationships besides the (required) one with the dimension key attribute.
As is well known, creating attribute relationships is a best practice in Analysis Services MD for improving query performance. The most common reason attribute relationships are created is to support a natural hierarchy – so your data model has to have one for this to arise. The next most common reason is to support attribute properties, such as a sort order – i.e. when the…

Part 1 – Analysis Services Multidimensional: “A duplicate attribute key has been found when processing”…

Introduction – Part 1
The most common and dreaded error that may occur when processing a dimension in Analysis Services Multidimensional (MD) is undoubtedly “Errors in the OLAP storage engine: A duplicate attribute key has been found when processing: Table: …. “   ‘Common’ because of both the poor data integrity frequently found in cube data sources, and improper modeling of the data in MD. ‘Dreaded’ because a number of distinct situations all give rise to this error and it can be difficult to diagnose which one is the actual problem. There is enough to explore around this error that this is Part 1.  There will be a Part 2 subsequently.
The full error message looks like “Errors in the OLAP storage engine: A duplicate attribute key has been found when processing: Table: ‘TABLENAME’, Column: ‘COLUMN’, Value: ‘VALUE’. The attribute is ‘ATTRIBUTE’.”  TABLENAME will…

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