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SSAS ROLAP Cube - Query Performance Tuning

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HiI created a ROLAP cube from oracle data source and it was successful and running fine for few days.I used Excel as a reporting tool and creating a Pivot tables.Later we are encountering a performance issue in the below scenario.I pulled measure on columns, and 1 dimension to rows. This is working fine as we expected and coming in 2 minutes which is acceptable.When I pull 2nd dimension attribute from same Dim table, then its taking hours and no response.I checked in trace and when I put second attribute from same Dim table, its trying to check all dimension attribute columns and trying to pull the whole data of 100 million instead of only the pulled columns.How do I fix this problem?Do we have any way in ROLAP, instead of processing the dimensions and measure, SQL Server Relational Engine should just generate the SQL Query and pull it from oracle data source.If I run the query that was generated by SQL Server Engine in Oracle its coming in 2 minutes.

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