Forum Discussion
Slow "Evaluating" MySQL - single small table no transformations
We are connecting to a MySQL DB in Azure through a Gateway sitting on a VM (latest version). We are struggling with very slow refreshes which appear to be due to the time taken "Evaluating" these que...
"Evaluating" means you have modified the meta data sufficiently that Power BI thinks it has to re-fetch it again. Refrain from making frequent design changes. Do not permit Power BI to probe or infer column types.
Subsequent refreshes (after you endured the "Evaluating" phase ) will run faster - until you make the next larger change.
Thanks for your reply lbendlin . Strange thing is there were no changes or transformations at all to the table and only 1 table in a clean model as a test. On Sunday 26 Feb - this issue sudddenly went away and refreshes became super fast (down from 2 hours to around 5 minutes) with no changes on our end so Microsoft definitely fixed the issue on their side.
