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AL Profiler in Business Central


In this blog, I would like to discuss the AL Profiler.
Also, I will be sharing my views on how the AL profiler relates to the Performance Profiler.


  • Basic understanding of Profiler

Books & References: 


In order to get the AL Profiler up and running there are a few steps on very high level.
You need to create a snapshot debugger  then you will need to initialize the debugging session, record the snapshots and then generate the profiler file.
Lets see each in detail below -

1. Setup the Snapshot Configuration:
Once you create a Project, you can create a Snapshot configuration in launch.json file.
    "version": "0.2.0",
    "configurations": [
            "name": "Sandbox",
            "request": "launch",
            "type": "al",
            "environmentType": "Sandbox",
            "environmentName": "sandbox",
            "startupObjectId": 22,
            "startupObjectType": "Page",
            "breakOnError": "All",
            "launchBrowser": true,
            "enableLongRunningSqlStatements": true,
            "enableSqlInformationDebugger": true
            "name": "Snapshot",
            "request": "snapshotInitialize",
            "type": "al",
            "environmentType": "Sandbox",
            "environmentName": "sandbox",
            "breakOnNext": "WebClient",
            "executionContext": "Profile",
            "tenant": "e20094eb-a50d-4d93-9721-fc9a8834c92f"

Note the following changes in Snapshot configuration
  • Request - Tells the VS Code to Initialize a snapshot session with the configuration
  • BreakOnNext - Tells when to start the snapshot session. Basically after you have initialized the snapshot debugging from VS Code, you will have to open another sessions and then the snapshot begins.
  • ExecutionContext - Tell the BC Server whether you will be using the snapshots for Debugging or Performance Profiling or Both
  • ProfilingType - Tell at what sampling rate should the snapshots be captured. Instrumentation means all the frames and sampling means capture only at sampling rate.
2. Start the Snapshot Session:

To start the Snapshot Session, you will need to hit F7 to Initialize Snapshot Debugging.
OR Hit Ctrl + Shift + P to get the command selection and select Initialize Snapshot Debugging.

Once the Snapshot is initialized, you need to start the session by click on SnapShot Debug icon on left corner (below)

You will need to select the Snapshot session

Now start Business Central Session for the Snapshot session to start capturing your processes.
If everything is fine then you will get a pop-up for snapshot debugging.
You can now run your process that you need to analyze for performance.

3. End the Snapshot Debugging Session:
Once you are done with running the process, you can stop the Snapshot Debugger by hitting Alt + F7 or Hit Ctrl + Shift + P and select Finish Snapshot Debugging Session.

You will need to select the Snapshot Debugging session in VS Code to finish.

After few seconds your Snapshot Debugging should stop and a ZIP file should be created in .snapshots folder.
Using this Snapshot File you can generate the AL Profiler File.

4. Generate the Profile File:
To generate the AL Profiler File, you can hit Ctrl + Shift + P  and select Generate Profiler File.

Also, select the session to generate AL Profiler File from

Once the Profiler File is generated, you will see the .alcuprofile file in .snapshots folder, you will get a response from CLI Output and you can open the profiler file and get the report just like in Performance Profiler.


Thank you for reading and hope this blog helps. In the upcoming blogs I will also write about Snapshot Debugging in Business Central.



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