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Mattw112IG
Impactful Individual
Impactful Individual

Delegation Issues in Power Apps

I have an app that I want to be able to use larger datasets from CDS, maybe in some cases up to 10K records.

 

How do I make this work?

 

Any good articles or instructions?

 

Thanks,

Terry

6 REPLIES 6
KranthiTupakula
Responsive Resident
Responsive Resident

@Mattw112IG 

 

Here is the best video tutorials on Delegation for you.

https://www.youtube.com/playlist?list=PLTyFh-qDKAiE6ia-D94Qk5-AzpN4dqOmD

 

Thanks

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timl
Super User
Super User

Hi Terry,

To help us, can you provide a use case scenario of the delegation issues that you're trying to avoid?

If you're coming at this from a SharePoint background, a big difference is that the CDS provides much better support for delegable queries.

For example, better support for 'Not' type searches, datetime searches, contains type searches. Even aggregate operations such as sum, min, max are delegable. Other features include CDS views, rollup columns, and you can pre-process/aggregate data with data flows.

I suspect there aren't many articles or instructions on this topic because delegation issues are not as prevalent with CDS data sources.

v-yutliu-msft
Community Support
Community Support

Hi @Mattw112IG ,

Do you want to know how to  use larger datasets from CDS in powerapps.

Deal to the delegation limit, the key point is to avoid the effect of delegation.

Two solutions:

1)only use delegate function

delegate functions for CDS:

Item Number [1] Text [2] Option Set DateTime [3] Guid
Filter Yes Yes Yes Yes Yes
Sort Yes Yes No Yes -
SortByColumns Yes Yes No Yes -
Lookup Yes Yes Yes Yes Yes
=, <> Yes Yes Yes Yes Yes
<, <=, >, >= Yes Yes No Yes -
And/Or/Not Yes Yes Yes Yes Yes
StartsWith - Yes - - -
IsBlank Yes [4] Yes [4] No [4] Yes [4] Yes
Sum, Min, Max, Avg Yes [5] - - No -

 

2)save data to collection , then deal with data in collection

In collection there's no delegation limit.

However, please notice that you need to consider delegation limit when saving data to collection.

For example, you have a column named ID in your entity. Each item has its unique ID value.

Then you could use formula like this to save data to collection:

ClearCollect(collection1,Filter(entityname,ID<=2000));
ClearCollect(collection2,Filter(entityname,ID>2000,ID<=4000));
ClearCollect(collection3,Filter(entityname,ID>4000,ID<=6000));
ClearCollect(collection4,Filter(entityname,ID>6000,ID<=8000));
ClearCollect(collection5,Filter(entityname,ID>8000,ID<=20000));
....

Then deal with data in collection one by one:

Filter(collection1,....)
Filter(collection2,....)

//this time, you do not need to consider only using delegate functions.

Do not forget to change delegation limit to 2000.

delegation.jpg

 

Here's a doc about delegate functions for CDS in details for your reference:

https://docs.microsoft.com/en-us/connectors/commondataservice/

 

 

Best regards,

Community Support Team _ Phoebe Liu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Thanks everyone.

 

More about the scenario is,

 

I created an app back when Covid first started.  At the time I just built it with a SharePoint backend.

 

But the adoption of this app within my company has been huge with about 2000 users using it every day across 60 offices.

 

When I built it, I created a SharePoint Site with multiple lists per site for each office because I was worried about speed if that many people were all hitting it at the same time and because of the 2000 item limits.

 

Right now across all those offices we have about 50,000 records in a certain list.  So if I had 1 app for all we would've passed 2000 the first day.

 

But now for the last month or so some offices have been passing that 2000 mark on a regular basis and I've had to daily go in and delete data to keep things running.

 

So I have two pains right now.

 

1.) 60 apps that are identical that if I want to make an update too I have to do 60 times and it takes at least 6 hours to do.

2.) Daily having to go in and delete data.

 

So, I created a CDS and built out the tables the same as I have in SharePoint Lists, with the same fields, etc.

 

My thinking was to recreate this app using that as a backend.

 

If I do this will I be able to just create 1 app and still have good enough or better performance?

 

Will I be able to handle the number of records without having to delete daily?  If we have 50K after 5 months, it could be quite large.

 

That is where the delegation question comes in and how to handle that?

 

For reporting I would prefer not to delete records we would want to keep them.

 

If I pulled everything into a collection would that take tooo much time every time someone launched the app?

 

Another question I have on PowerApps... is it possible for people to select a setting, "Office" for example, that would be their default when they log in vs someone else's settings?  I would pull from AD but people may want to have a different office as their default that what appears in AD.

 

Thanks,

Terry

 

Hi @Mattw112IG ,

No matter you choose what data source, you will always meet delegation limit.

This is powerapps' limit. 

To deal with delegation problem, you need to use : delegate data source+ delegate functions +collection

Delegate functions: CDS, sharepoint or SQL.

The differences between them are: delegate functions are different for them.

So to choose which as data source, you could base on what functions do you want to use.

Delegate functions for CDS:https://docs.microsoft.com/en-us/connectors/commondataservice/

Delegate functions for SQL: https://docs.microsoft.com/en-us/connectors/sql/

Delegate functions for sharepoint:https://docs.microsoft.com/en-us/connectors/sharepointonline/

 

Every time you saving data to collection will cost some time. The length of time is determined by the data amount.

Using collection is the only solution to deal with large data set if you want to use not delegate functions.

 

Last question: Do you want to pull user data not from azure ad? I'm afraid it's not supported in powerapps. About user information, all data comes from azure ad.

 

 

Best regards,

Community Support Team _ Phoebe Liu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hi Terry,

Congratulations for building an app with such wide adoption! It's a great achievement.

I understand how painful it would be to manage 60 identical apps and to need to delete data from all those apps on a daily basis.

It's difficult to comment on what the performance would be like if you were to create a single app that's based on the CDS. Much of this would depend on the data that you want to retrieve from your app, and the formulas/expressions that you're using.

If you were using workarounds to overcome delegation limits in SharePoint, you would expect much better performance by using expressions that are natively delegable in the CDS.

On balance, you will probably experience better performance with the CDS. However, what I would suggest is that you test this by writing a Flow or Dataflow, and to write a loop that populate an entity with 100k rows so that you can test how your specific galleries, search, and other features that you've built into your app behave with that quantity of data.

The CDS is the data source that Dynamics 365 uses, so it's definitely capable of handling 50k records and more.

I would recommend against pulling everything into collection every time someone launches the app. I would only use this as a last resort.

In terms of creating a 'profile' setting (such as "Office"), one way you could accomplish this is to create a custom entity and to store the value there.

 

 

 

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