Duplicate Attribute Key Error Ssas 2008
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Ssas A Duplicate Attribute Key Has Been Found When Processing Table
Sep 2013 10:46 AM Last revision by Craig Lussier (Microsoft Partner) When: 20 Jan 2014 8:01 PM Revisions: 9 Comments: 1 Options Subscribe to Article (RSS) Share this Engage! Wiki Ninjas Blog (Announcements) Wiki Ninjas on a duplicate attribute key has been found when processing date dimension Twitter TechNet Wiki Discussion Forum Can You Improve This Article? Positively! Click Sign In to add the tip, solution, correction or comment that will help other users.Report inappropriate content using these instructions. Wiki > TechNet Articles > Analysis Services: Errors in the OLAP storage engine: A duplicate attribute key has been found when processing Analysis Services: Errors in the OLAP storage engine: A duplicate attribute key has been found when processing Article History Analysis Services: Errors in the OLAP storage engine: A duplicate attribute key has been found when processing The full error message is “SSAS Error: Errors in the OLAP storage engine: A duplicate att
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message during dimension processing I've been asked about quite a few times so I thought it would be worth posting about it. The error message says that a duplicate attribute key http://ms-olap.blogspot.com/2009/11/duplicate-attribute-key-has-been-found.html has been found when processing as shown in the following screenshot for a test cube http://www.sqlservercentral.com/Forums/Topic908818-17-1.aspx (I just processed one dimension here): Here's the full error message: Errors in the OLAP storage engine: A duplicate attribute key has been found when processing: Table: 'dbo_Product', Column: 'ProductGroup', Value: ''. The attribute is 'Product Group'. When you got to this article because you just ran into this problem you probably don't want to read much about attribute key the background but only want a solution. Unfortunately I found at least three possible reasons for this error message: Reason 1 (likely): The most likely reason for that error is that you are having NULL values in your attribute key column.If you simply created the attribute by dragging it from the source view, BIDS only sets the key column (name and value column default to the key column in this case), so for duplicate attribute key example if you have a column ‘Product Group' in your source table and drag it to your dimension, the product group (Text field) will automatically become the key for this attribute. The attribute is listed in the error message (in the example above it is ‘Product Group'). Solution: Try avoiding those NULL values in your data source (for example by using a DSV query and the T-SQL coalesce-function). When your source data is a data warehouse it's also a good practice to avoid null values as they complicate the queries to the data warehouse. Reason 2 (likely): You defined an attribute relationship between two attributes of the dimension but the data in your source tables violates the relationship. The error message gives you the name of the conflicting attribute (text part ‘The attribute is…'). The attributes has a relationship to another attribute but for the value stated in the error message (‘Value: …') there are at least two different values in the attribute that the relationship refers to. If you have BIDS Helper installed, you can also see the error details and all violating references when using the ‘Dimension Health Check' function. Solution: You may solve the error by making the key of the attribute unique. For example: Errors in the OLAP storage engine: A duplicate attribute k
Recent PostsRecent Posts Popular TopicsPopular Topics Home Search Members Calendar Who's On Home » Data Warehousing » Analysis Services » A duplicate attribute key has been found... A duplicate attribute key has been found... Rate Topic Display Mode Topic Options Author Message winston Smithwinston Smith Posted Thursday, April 22, 2010 10:23 AM SSC Eights! Group: General Forum Members Last Login: Tuesday, September 27, 2016 1:58 AM Points: 927, Visits: 2,033 im going through an exercise book with examples of SSAS cube creation and deployment.One exercise is to create a time dimension in a cube. The dimension is created from a date column already in the fact table.The Time Dimension has 4 attributes:Date -pkMonthquarteryearwhen i try to process the dimension i get the error:Errors in the OLAP storage engine: A duplicate attribute key has been found when processing: Table: 'dbo_ManufacturingFact', Column: 'YearOfManufacture', Value: '2008'. The attribute is 'Quarter'.I have completely emptied all dimension and fact tables and repopulated them but issue still exists.I have recreated the time dimension, ensuring to set up the hierarchy correctly so that each child can have only one parent ( see this article: http://blog.programmingsolution.net/ssas-2008/period-dimension-time-dimension-creation-with-year-month-day-hierarchy/)I have tried setting MemberNamesUnique to false, and setting the trim property to NONE, but still facing the issue.I ran a trace when trying to process the dimension, and only two queries are run, first returning all the distinct quarters, and the second returning all distinct years and their quarters.I cant see any duplicates so i cannot see where this error is comming from. any ideas? Post #908818 stevefromOZstevefromOZ Posted Thursday, April 22, 2010 10:55 AM SSCommitted Group: Moderators Last Login: Saturday, August 20, 2016 7:31 AM Points: 1,895, Visits: 3,752 Do you have your attribute relationships set up in the dimension? To avoid this style of issue, we also generally create unique keys for each attribute value. So for e.g., if you have the following info (simplified)Year Quarter2008 Q12008 Q22008 Q32008 Q42009 Q12009 Q2we would set the key for quarter to be something like 2008Q1 and 2009Q1 rather than simply Q1 for both years. Steve. Post #908856 winston Smithwinsto