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Anonymous
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Collecting from Azure SQL Slow - Waiting (TTFB)

Hi All,

 

I am working very hard to narrow down a performance issue with powerapps when collecting data from an Azure SQL DB.  I am using timers to achieve conecurrent requests as detailed in the "Performance Considerations" blog post and collecing from 6x tables. The amount of data is minimal and the Azure SQL Server is overpowered with no queries taking longer to run that 20ms and resources never being remotely strained.  About 60% of the time this collection process takes 1-2 seconds.  The other 40% is wildly un reliable taking up to 20 seconds.  I have been performing network traces through fiddler as well as the Chrome Dev tools and can see each request being sent and the breakdown of time that each part of that request took. ALL the time is spent on Waiting (TTFB) which appears to be something that i have no control over.  The SQL queries run quickly, and it is on top of Azure SQL which should be fully supported and responsive.  Any ideas, i really need help here and am at my last straw with a customer on resolving the issue. I have a case open as well but i am looking to get info from everyone i can. 

 

The attatched image only took 4+ seconds which is still not good but much better thant he 14, 18, 22 second times that i have seen on a regualr basis.

24 REPLIES 24

Thank you for the response and feedback.

 

I work with the Azure Data Integration team - we maintain the SQL connector which handleds the request from PowerApps and translates the request and forwards it on to the actual SQL server. I'm assuming you are working with SQL Azure? or is this an on-premise installation? 

 

Thanks,

-Cameron

Anonymous
Not applicable

This is Azure SQL. I have a case open which can be referenced from the below ID where I have provided a lot of info over weeks.  I just need to get this solved or understand that it cannot be and is something I am doing.

 

REG:118062818482478

 

Can you see cases? If not I can forward you the thread if you can provide an email.  It has been incredibly frustrating and a very long process.  If you can help in anyway i would be very thankful, would be happy to do a screen share and review the SQL DB as well.  Just let me know what you need.

Anonymous
Not applicable

After making enough noise i have gotten through to the product team.  We were able to uncover a previously unknown isuses see below for the response:

 

"we have identified an issue with the engine that is hosted by the connector to interface with SQL – it occurs sporadically when attempting to Open an OleDbClient connection with the server. We are attempting to simulate a configuration change that might help us avoid this codepath. At this point, we believe it may be possible but it has some implications with regards to caching data that might hamper its viability as a workaround. At the same time, we are pursuing a code fix for the issue itself. We are also looking at a Plan B approach that might avoid the engine completely which would push calls directly from the connector to SQL. This is a code change we’ve been cooking for a while and we would need to accelerate its deployment, which has some risks."

 

Will update my many forum posts as information is revealed.

Anonymous
Not applicable

 
Anonymous
Not applicable

@Anonymous Thank you for continuing to press this issue. I also have widely varied wait times with the sql connector.

I recently moved my data from sql to SharePoint in an attempt to address this performance issue, and unfortunately I'm now running into varied wait times with SharePoint. The long wait occurs when I attempt to concurrently collect two tables (the largest being 401 records).

 

I'll be following this thread waiting for a fix.

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