Power Automate

This post covers how to configure a Power Automate Flow to get items from a SharePoint list at maximum speed. Super useful if you have an interactive process and you do not want to keep users waiting.

This post is part of a three part series of blog posts, before proceeding please read this post which describes the objectives, pros and cons of each method. It also provides links to the exported flows and sample data which I used to build the flows:

The many ways to retrieve more than 5,000 items from a SharePoint list using Power Automate

If you have not used a parallel branch before, this blog post is worth reading.

Before getting into the technicalities, have a look at the complete flow. If you have already built the more SharePoint API version detailed in this post, it will make sense.

General Premise

This flow retrieves the SharePoint items using the same method as the flow provided in this post. But the work of collecting data from SharePoint is split over four parallel branches, which execute at the same time. Instead of waiting for a single batch of 5,000 to be collected before proceeding to get the next batch.

Changes from the SharePoint API Flow

Several changes were made to the SharePoint API flow:

Variable Declarations

There are some extra values declared and defined at the start of the flow which control how the four branches choose which section of data to return:

Get the Lowest ID from the SharePoint list using the REST API

The lowest ID from the list is retrieved using the HTTP request to SharePoint action and uses the following code:

_api/Web/Lists/GetByTitle('5000 Item Test')/Items?$select=ID&$filter=ID gt 0&$top=1&$orderby=ID asc

Get the Highest ID from SharePoint list using the REST API

Same as the above flow step, but repeated to get the highest ID, uses the following code:

_api/Web/Lists/GetByTitle('5000 Item Test')/Items?$select=ID&$filter=ID gt 0&$top=1&$orderby=ID desc

Gets the Total Item count from the SharePoint List using the REST API

The total item count of the list is returned by using the ItemCount method of the SharePoint API:

_api/Web/Lists/GetByTitle('5000 Item Test')/ItemCount

Declare the control variables for each parallel branch

Because there are four parallel threads, all of the variables which operate within each branch are declared four times.

In the previous example, there was a single integer, array and boolean variable to control the do until loop that was retrieving SharePoint data. Now those variables need to be declared for each parallel branch:

The main control block for the Parallel Branches

In the control block for the parallel branches, a compose action is used to divide the total item count by four to determine the amount of data each branch should retrieve:

div(variables('itemCount'),4)

The control mechanism for the do until loops was modified to be more efficient, by changing the step which checks if there were no results from SharePoint

if(
	empty(body('HTTP_to_SharePoint_to_get_First_Quarter_of_Results').value),true,
	if (
		less(length(body('HTTP_to_SharePoint_to_get_First_Quarter_of_Results').value), 5000),true,false
	)
	
)

This removes an iteration of the loop, by checking if either of the following conditions are true:

• The result set from SharePoint was empty
• The number of results returned from SharePoint was less than 5000

SharePoint API Query for each branch

The SharePoint API query is different for each parallel execution of the data collection.

Each branch collects data according to the batch size defined by dividing the total item count by four and begins at the lowest ID in branch one. ?Next, branch two begins at the end of branch one and so on, so that all items are collected.

Branch 1

_api/Web/Lists/GetByTitle('5000 Item Test')/Items?$select=ID,EmpNo,Title,Last,Furloughed,Telephone,Email,Brand&$filter=ID gt @{variables('intID')} and ID le @{add(body('getLowestID')?['value'][0]['ID'], mul(outputs('DivideTotalByFour'), 1))}&$top=5000"

Branch 2

_api/Web/Lists/GetByTitle('5000 Item Test')/Items?$select=ID,EmpNo,Title,Last,Furloughed,Telephone,Email,Brand&$filter=ID gt @{add(body('getLowestID')?['value'][0]['ID'], mul(outputs('DivideTotalByFour'), 1))}  and ID gt @{variables('intID2')} and ID lt @{add(body('getLowestID')?['value'][0]['ID'], mul(outputs('DivideTotalByFour'), 2))}&$top=5000

Branch 3

_api/Web/Lists/GetByTitle('5000 Item Test')/Items?$select=ID,EmpNo,Title,Last,Furloughed,Telephone,Email,Brand&$filter=ID ge @{add(body('getLowestID')?['value'][0]['ID'], mul(outputs('DivideTotalByFour'), 2))}  and ID gt @{variables('intID3')} and ID lt @{add(body('getLowestID')?['value'][0]['ID'], mul(outputs('DivideTotalByFour'), 3))}&$top=5000

Branch 4

_api/Web/Lists/GetByTitle('5000 Item Test')/Items?$select=ID,EmpNo,Title,Last,Furloughed,Telephone,Email,Brand&$filter=ID ge @{add(body('getLowestID')?['value'][0]['ID'], mul(outputs('DivideTotalByFour'), 2))}  and ID gt @{variables('intID3')} and ID lt @{add(body('getLowestID')?['value'][0]['ID'], mul(outputs('DivideTotalByFour'), 3))}&$top=5000

Compile all results and send back to PowerApps

The response step simply uses a Union action to bring all the SharePoint data back in a single step:

union(variables('arrItems'),variables('arrItems2'),variables('arrItems3'),variables('arrItems4'))

Summary

Using Parallel branches to fetch SharePoint data can provide a huge speed benefit over a standard do until loop at the expense of creating a more complicated flow but it can be worth it to provide the best possible user experience.

It may be easier to just download the exported flow and modify to your requirements than build it from scratch.

You can download the flow and sample data from this post.

If you need to get more than 5000 items from a SharePoint list, there are a number of different approaches. I’ve written up three different ways to solve the problem, which return exactly the same result, but have very different execution times. To get an overall understanding of this problem, check out the YouTube video I produced:

My requirement is to return 17,000 SharePoint list items to a PowerApp. I used Power Automate to get the data but found the standard “Get Items” action to be too slow. A good user experience is essential for application acceptance.

Eventually, I was able to reduce the amount of time that the Flow takes to retrieve the items from 2 minutes down to 8 seconds! That’s 13 times faster!

Since I originally wrote this post, I have figured out a method that is even easier and faster! Check it out here.

Links to my sample data and all the flows created are at the end of the post.

My example data looks like this:

It’s 7 columns wide, 17,000 rows of data. Here is how long it took Power Automate to execute the flow with execute each method:

Method	Time to Execute
Standard “Get Items”	111 Seconds
Standard “Get Items” with Select Action	67 Seconds
Retreiving same data with SharePoint API	31 Seconds
Retreiving same data with SharePoint API and two parralel queries	19 Seconds
Retreiving same data with SharePoint API and four parralel queries	13 Seconds
Same as above with optimised flow	8 Seconds

The table shows the results from six variations on three different themes. The fundamental principal behind each method is a “Do until” loop which collects the entire contents of a SharePoint list into an array. Each method has some pro’s and cons.

Which method to use?

The right method to use, depends on your circumstances. Here are some suggestions on what method may work best for you:

• If your flow is not time sensitive, just use the standard “Get Items” action with a “Do Until” Loop in Power Automate. The flow is simple and easy to build.
  Get more than 5000 items from SharePoint with Power Automate
  
• If you are already using the “Get Items” method but need it to be a bit faster, enhance the speed of it by adding the “Select” action.
  Get more than 5000 items from SharePoint with Power Automate
  
• If the performance gained from the “Select” action still does not meet your requirements, switch to using the SharePoint API. It is almost the same as using “Get Items”, but drastically faster.
  Use the REST API in Flow to get over 5000 items from SharePoint
  
• Finally, using parallel execution to retrieve chunks of SharePoint list data simultaneously increases speed further. But it does make the flow more complicated.
  Combine SharePoint API & Flow Parallel branches for Performance

Why is the SharePoint Get Items action so slow?

The “Get Items” from SharePoint in Power Automate is very slow. The primary reason is the size of the payload that it returns from SharePoint. In addition to returning the columns defined in your SharePoint view, it also returns many other columns and metadata.

A single row of the sample data above results in this from SharePoint:

{
	"@odata.etag": "\"1\"",
	"ItemInternalId": "1",
	"ID": 1,
	"Title": "Terry",
	"EmpNo": 1.0,
	"Last": "Carter",
	"Furloughed": 1.0,
	"Telephone": "(462) 723-7695",
	"Email": "[email protected]",
	"Brand": "PowerBI",
	"{Identifier}": "Lists%252f5000%2bItem%2bTest1%252f1_.000",
	"{IsFolder}": false,
	"{Thumbnail}": {
		"Large": null,
		"Medium": null,
		"Small": null
	},
	"{Link}": "https://accendo1.sharepoint.com/sites/DocumentManagementTest/.....",
	"{Name}": "Terry",
	"{FilenameWithExtension}": "Terry",
	"{Path}": "Lists/5000 Item Test1/",
	"{FullPath}": "Lists/5000 Item Test1/1_.000",
	"{HasAttachments}": false,
	"{VersionNumber}": "1.0"
}

That’s a huge amount of extra fields, which results in a massive payload. 5,000 rows of my sample data created a JSON response which was 3,545 KB.

The same 5,000 rows of data when passed through the “Select” action produces a JSON response which looks like this:

{
	"Id": 1,
	"Title": "Terry",
	"EmpNo": 1.0,
	"Last": "Carter",
	"Furloughed": 1.0,
	"Telephone": "(462) 723-7695",
	"Email": "[email protected]",
	"Brand": "PowerBI",
	"ID": 1
}

For the same 5,000 records, the JSON response in flow was only 772 KB – A massive reduction. So passing the response from Get Items through the select action can make a big difference to how quickly your flow will run, and it is super easy to do.

Use the Sharepoint API for maximum speed

Although the “Select” action in Power Automate described above improves the speed of a flow within a do…until loop, the “Get Items” action is still retrieving a lot of unwanted data from SharePoint.

Using the SharePoint API allows you to get exactly the data you want without retrieving any unwanted columns or metadata.

Fortunately, this is very easy to do using the SharePoint API using the “Send an HTTP request to SharePoint” action. Compare these two flow actions:

These two actions, essentially perform the same operation, but the second one returns only the requested columns. Here is the difference in execution time:

Use Parallel Branching to get batches of 5000 items simultaneously.

Using the SharePoint API to get list data into Power Automate makes a huge difference to the speed of the operation. But it still gets the data in batches of 5000 blocks. With my 17,000 row sample the do-until loop has to execute four times to collect all of the data, all of which takes valuable time.

By using the parallel branch actions in Microsoft Power Automate we can engineer a solution which works much faster.

I tried collecting SharePoint data with two and four parallel branches. With four, I was able to get all 17,000 items in 8 seconds. The downside is that the flow is more complicated.

Conclusion

The standard Get Items action in Power Automate is fine for basic operations, but if you need more control, or speed, then there are better options.

I’m happy with the performance improvements I managed to create. Retrieving data from SharePoint is key to many applications and SharePoint handles the simultaneous requests well.

Example Data and Flows

You can download both my sample data and the flows discussed in these posts from here:

• Test Data to upload to SharePoint list
• v1 – Using the Get Items Action
• v2 – Using the Get Items Action with Select action
• v3 – Using SharePoint API to retrieve items
• v4 – Using SharePoint API and Two Parallel Execution Branches
• v6 – Using SharePoint API and Four Parallel Execution Branches

Adapting the flow to return SharePoint data to a jQuery grid

In the YouTube video above I also provided a demo of a jQuery grid that drew data from the SharePoint list using Power Automate, you can view that demo here:

Demo of jQuery based grid retrieving SharePoint data via Flow

You can easily copy the source code from that page, the flow has been left unsecured so that you can try it out.