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awe_powerapps
Frequent Visitor

Powerapp data source refresh

Hi Team, 

 

I am now working on an app and have the following problem.

 

My app have a gallery lookup the datasource , with proper delagation, but everytime I refresh the datasource behind, I can record a very large network traffic (~13mb), The situation happen even if I set the limit of non-delagation limit to 10. 

 

I would like to know if I use refresh("table"), is the whole table will be downloaded? how can I refresh the gellery info without refresh the whole datasoure in this case?

 

Thanks,

 

5 REPLIES 5
v-yutliu-msft
Community Support
Community Support

Hi @awe_powerapps ,

Firstly, refresh function is just to refresh data source, not download data in data source.

I'm afraid it's not supported to only refresh part of data source in powerapps currently.

It will automatically refresh the whole data source.

 

Secondly, powerapps only call data from data source. It will not save data in data source in its cache.

If you want to reduce the network traffic , you could consider using collection and display it in gallery. Collection will not cause network traffic.

 

Thirdly, I suggest you read this doc to improve your app's performance, which will reduce the network traffic a lot:

https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/performance-tips

 

 

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.

Dear @v-yutliu-msft ,

 

Thanks for your reply.

 

From your reply, do you mean that everytime I call the refresh function , I will retrieve the whole table? which cause the heavy network traffic? but my table have more than 10K record, it's not make sense to retrieve all of that everytime.

 

Also, If I will retrieve the whole table when I call refresh function, what's the purpose of delagation in lookup/search? I just can't understand.

 

Maybe let me clarify my situation more clearly, I have a app with classic senerio of list, edit, new, detail page, the datasource is located at D365 CDS , and have about 10K record, but user will only view about -20 record each time with some search condition. after they edit/ new a record, list will be refresh to show their modification. For this situation, can you suggest a best practice for implementation?

 

Thanks, 

Hi @awe_powerapps ,

1)If you use refresh function in powerapps, you will refresh the whole data source.

I'm afraid it's not supported to only refresh part of data source.

Every time you update, you will refresh the whole. It will indeed cost some time.

2)The meaning of delegation is to deal with data in data source when data number is larger than 2000, not refresh data.

(PowerApps could only deal with 2000 records in local at most.)

3)The reason why you can not get all the data is because of delegation problem.

You need to use delegate data source and delegate functions to delegate data.

 

About your situation, you could try these two solutions:

1)save data in collection, update collection every time you want to refresh data source

In collection, you will not have delegation problem.

2)change all your formulas, only use delegate functions.

Here's a doc about delegate functions in CDS:
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.

Hi @v-yutliu-msft ,

 

Still abit confuse, can you please verify following situation?

 

1)if I have a gallery binding with a datasouse with proper delagation search, when there is any update to the datasource, am I still need to refresh the datasource (refresh the whole table) ?, and it will cost some time (very slow indeed).

 

2)if I adopt your suggestion, use a collection to save required data from datasource, when there is a update to the datasouce, before I retrieve again the required data to collection, should I refresh the datasource first? (If yes, then it will still cost time)><.

 

Is there any method I can retrieve the updated data without refreshing the whole table everytime? this should be common to any system design.

 

Really thanks for your help.

Hi @awe_powerapps ,

I'm afraid you need to refresh your data source every time when you want to load the latest data.

And there's no way to only refresh part of data source. Every time you refresh, you will refresh the whole data s ource.

Actually, I do not recommend you update your data source too frequently when you are using this app, or else you need to refresh multiple times to always load the latest data.

For now, I could only suggest you improve your app's design to improve your app's performance.

Some tips about it:

https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/performance-tips

 

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.

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