Forum Discussion
Does a measure append the SQL in Direct Query Mode?
Hi,
I have noticed that the SQL that PowerBI generates is not that hot with regards to joins etc (slow to load) ....
We have rewritten the code it outputed to make it quicker.
Does having a Calculate measure affect the SQL that is generated from PowerBI and if so is it then better to try and do the calculate in SQL or ar measures handled on the data that is retrieved from the Server?
Thanks
Chris
2 Replies
Hi Anonymous,
In DirectQuery mode, by default, measures are restricted to simple measures that are unlikely by themselves cause any performance issues. If enable Allow unrestricted measures in DirectQuery mode, the complicate measure may cause the performance issue.
You should import data to Power BI wherever possible. This takes advantage of the high performance query engine of Power BI, and provides a highly interactive and fully featured experience over your data. If import mode can't meet the requirement, then choose DirectQuery. But some expressions that perform well when the data is imported may result in very slow queries to the backend source when in DirectQuery mode. For detail information, you can go through this article: Power BI and DirectQuery.
Best Regards,
Qiuyun YuHi
I have noticed that the SQL that PowerBI generates is not that hot with regards to joins etc (slow to load) ....
We have rewritten the code it outputed to make it quicker.
Does having a Calculate measure affect the SQL that is generated from PowerBI and if so is it then better to try and do the calculate in SQL or ar measures handled on the data that is retrieved from the Server?
Thanks
Chris
