Skip to main content
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

Calling all Data Engineers! Fabric Data Engineer (Exam DP-700) live sessions are back! Starting October 16th. Sign up.

Reply
Alirezam
Helper V
Helper V

Extremely slow query when processing a query

‎05-18-2021 06:08 PM

Hi,

I am reading multiple folders and process some xml. files in the power query editor. After adding a 'column' to calculate something, it is now taking few hours to load the query and apply the new steps. It is weird that as shown below, it looks like it is reading a massive file with over 1 GB but my data source is not bigger than 200 MB. Any idea would be appreciated.

 

Capture.PNG

 

 

 

Labels:
Message 1 of 3
1,120 Views
0
2 REPLIES 2
mahoneypat
Microsoft Employee
Microsoft Employee

‎05-18-2021 06:12 PM

Please see this video and article.  You are going to want to use Table.Buffer to avoid reloading your source data repeatedly.

(5) Inside Power Query reference queries for Power BI and Excel - YouTube

Power Query M Primer (Part 12): Tables—Table Think I | Ben Gribaudo

 

Pat

 





Did I answer your question? Mark my post as a solution! Kudos are also appreciated!

To learn more about Power BI, follow me on Twitter or subscribe on YouTube.


@mahoneypa HoosierBI on YouTube


Message 2 of 3
1,109 Views
Alirezam
Helper V
Helper V
In response to mahoneypat

‎05-19-2021 05:16 PM

Thanks, it was helpful however did not solve my issue with slowness.

Message 3 of 3
1,024 Views
0

Helpful resources

Announcements
FabCon Global Hackathon Carousel

FabCon Global Hackathon

Join the Fabric FabCon Global Hackathon—running virtually through Nov 3. Open to all skill levels. $10,000 in prizes!

FabCon Atlanta 2026 carousel

FabCon Atlanta 2026

Join us at FabCon Atlanta, March 16-20, for the ultimate Fabric, Power BI, AI and SQL community-led event. Save $200 with code FABCOMM.

View All
Top Solution Authors
View All
Top Kudoed Authors
View All