Forum Discussion
My DataFlow Gen 2 Fails with Unknown Evaluation Error 999999 (Request ID: fcd89914-0dd9-44ea-9b09-94
Thanks Alessandro.
I do have many queries that are not writing to a destination. I need those queries because I need to merge (join) them (denormalise) with other queries to have the final ouput table that then writes to a destination. I noticed that it is those queries without a destination that has staging enabled by default.
Could this be the cause of the problem? Should I disable staging for the queries without destination?
Thank you
Microsoft EmployeeHi sholy29,
staging such queries could be useful in some cases for performance reasons (see Data in Dataflow Gen2 staging - Microsoft Fabric | Microsoft Learn and Best practices for creating a dimensional model using dataflows - Power Query | Microsoft Learn), but it really depends on the kind of transformations and how big the datasets of such queries are.
The issue you reported should not happen, and if it persists consider raising a support ticket. But, as a workaround, you can uncheck the "enable staging" option for such queries and see if
- dataflow refresh succeeds
- the running time of the dataflow refresh does not increase significantly because the dataflow does not use staging anymore
Best regards,
Alessandro
Honestly, I disenabled the staging and still did not work. I removed all of the queries and brought them again and this time it worked. Howerver, I got anothe issue, the dataflow that took two minutes to finish now take 18 minutes for the same query as before and no addtional transformation step. I am really confursed. This is not the 3rd time dataflow gen 2 ci/cd has been given me issues.
v-prasareCommunity Support
Hi sholy29,
We are following up once again regarding your query. Could you please confirm if the issue has been resolved through the support ticket with Microsoft? If the issue has any update, we kindly request you to share the resolution or key insights here to help others in the community.
I’d encourage you to submit your detailed feedback and ideas via Microsoft's official feedback channels, such as the Microsoft Fabric Ideas.
Feedback submitted here is often reviewed by the product teams and can lead to meaningful improvement.
Thank you for your understanding and participation.
Hi v-prasare,
Unfortunately the issue was not resolved by the support ticket. Currently, the daflow refresh that ususlly takes 2 min now takes atleast 18 min to refresh. I am confused on what happened and why the high refresh time