Hello @BI-user25,
To optimise performance in Power BI models with many-to-many relationships, two complementary strategies are recommended:
1. Adjust Filtering Logic in DAX
Avoid bidirectional relationships wherever possible. Use single-direction filtering and, when cross-filtering is required, apply functions such as TREATAS or CROSSFILTER within measures. This approach reduces unnecessary filter propagation and improves calculation efficiency without compromising business logic.
2. Redesign the Model in Power Query
Many-to-many relationships often exist because the columns involved contain duplicate values. A practical solution is to create composite keys that guarantee unique identifiers for each row, enabling you to convert many-to-many relationships into one-to-many. This can be achieved by combining relevant columns (for example, CustomerID and ProductID) before loading the data into the model. This approach supports a star schema design, which is considered best practice for scalability and performance.
Official Guidance:
If this response was helpful in any way, I’d gladly accept a 👍much like the joy of seeing a DAX measure work first time without needing another FILTER.
Please mark it as the correct solution. It helps other community members find their way faster (and saves them from another endless loop 🌀.
If this response was helpful in any way, I’d gladly accept a kudo.
Please mark it as the correct solution. It helps other community members find their way faster.
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