row_number over partition sql server - error and performance in PowerBi

Hi galbo1993 ,

According to your description, your connection mode is "import", first of all, for this method, you need to know that it will import the data into power bi desktop. It means the data will be loaded into power bi desktop from data source and will consume memory and disk space. Then upon load, all of the data defined by those queries will be imported into the Power BI cache. Upon building a visual within Power BI Desktop, the imported data will be queried. Therefore, if your query is complex and involves a large amount of data, it may cause a slow query and thus timeout failure for power bi desktop.

So maybe your command are too complex so that it causes timing out and failing.

If you want to get a clear picture of what's going wrong, I suggest you click “performance analyzer” , it can help you identify visuals that are impacting the performance of your reports, and identify the reason for the impact.

Use Performance Analyzer to examine report element performance in Power BI Desktop - Power BI | Microsoft Docs

Or you can use “Diagnostic options”, it can help you achieve a better understanding of what Power Query is doing at authoring and at refresh time in Power BI Desktop.

Query Diagnostics - Power Query | Microsoft Docs

The above ways all can help you to check if it is a performance issues.

Best regards,

Community Support Team Selina zhu

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