Free PL-400 Practice Questions

Question 1

A synchronous Dataverse Update plug-in trims spaces from new_externalreference. It runs in PostOperation and calls service.Update on the same row. Tracing shows a second Update pipeline for every edit. The normalized text must be committed with the user's original write. How should the implementation change to eliminate the additional update?

Accepted Answer

Use PreOperation and assign the normalized value directly to Target.

Answer

Keep PostOperation and skip any execution with Depth > 1.

Answer

Use asynchronous PostOperation and update an Entity containing only the reference column.

Answer

Keep PostOperation and filter on new_externalreference.

Question 2

An account-search gallery uses this Power Fx formula against Dataverse:

Filter(Accounts, Left('Account Name', Len(txtPrefix.Text)) = txtPrefix.Text)

Power Apps flags the Left expression as nondelegable. Users can read all 60,000 accounts, but searches omit matching accounts outside the retrieved subset. The search must return names beginning with the entered text. Which replacement addresses completeness rather than merely enlarging the subset?

Accepted Answer

Use Filter(Accounts, StartsWith('Account Name', txtPrefix.Text)).

Answer

Cache Accounts with ClearCollect, then apply the existing filter to the collection.

Answer

Replace Filter with LookUp while retaining the existing Left expression.

Answer

Set the nondelegable data row limit to 2,000 and retain the formula.

Question 3

A managed solution release imports successfully, yet a model-driven app still executes an older JavaScript web resource. Publishing and testing in a fresh browser session do not help. The component's solution layers show the new managed code beneath an active unmanaged customization containing the old code. That customization has no changes that need to be retained. Select the narrowest correction that exposes the deployed code.

Accepted Answer

Remove the active unmanaged customization from that web resource.

Answer

Delete the unmanaged solution container used for the edit.

Answer

Increase the managed solution version and import the same content again.

Answer

Roll back the release by restoring the entire environment from its previous backup.

Question 4

While testing a PCF slider on a model-driven form, a developer observes that dragging changes the component's local currentValue from 4 to 7, but the bound form column remains 4. The manifest declares value as a bound numeric property, and getOutputs correctly returns { value: this.currentValue }. The component must update the form's unsaved value rather than write directly to Dataverse. What should its input handler do after updating currentValue?

Accepted Answer

Call the notifyOutputChanged callback captured in init; let the framework call getOutputs.

Answer

Call getOutputs directly and discard the returned object after reading it.

Answer

Assign 7 directly to context.parameters.value.raw to update the host binding.

Answer

Call updateView with the existing context to request a new host value.

Question 5

A reservation service must be callable from a model-driven command, a cloud flow, and an external application. Each call validates an order, updates a reservation, and creates an audit row in Dataverse standard tables. The writes must commit or roll back together, and the caller needs the reservation ID in the response. The team will implement the operation in C#. Which component provides the appropriate reusable boundary?

Accepted Answer

A custom API action whose main-operation plug-in uses IOrganizationService for both writes.

Answer

A JavaScript web resource that issues two Web API writes.

Answer

A custom connector exposing independent reservation and audit write actions.

Answer

A Dataverse-triggered cloud flow that creates the audit row after the reservation is saved.

Question 6

An integration reads a Dataverse row and retains its ETag. Before the integration submits a PATCH with that ETag in If-Match, another user changes the same row. Optimistic concurrency is enabled, the row still exists, and Dataverse returns HTTP 412. The integration must preserve changes made since its read. What is the appropriate recovery?

Accepted Answer

Retrieve the latest row, reconcile the conflict, and retry with its ETag.

Answer

Retry the same payload using If-Match: *.

Answer

Retry the unchanged request after an exponential delay to let the write lock clear.

Answer

Suspend all writes to the table pending an administrator's review.

Question 7

Two ERP systems send orders to a Dataverse standard table. Each system assigns order numbers independently, so both can have an order numbered 74018. Every message includes a populated source-system code and order number, but no Dataverse GUID. Multiple workers may receive the same order concurrently, and later deliveries must update that order rather than create duplicates. Which write strategy preserves the intended identity?

Accepted Answer

Use an active composite alternate key on both identifiers with UpsertRequest.

Answer

Use an alternate key on order number with UpsertRequest.

Answer

Generate a new GUID for every delivery and pass it to UpsertRequest.

Answer

Query both identifying columns before each CreateRequest, using the query result instead of an alternate key.

Question 8

A contact's account lookup cannot be updated. The salesperson has Read and Write on Contact and Read on Account, but neither Append nor Append To on either table. Both records are accessible; ownership and secured columns are not involved. To permit the link, which additional privilege pair is required?

Accepted Answer

Append on Contact, with Append To on the target Account.

Answer

Append To on Contact, with Append on Account at the required access depth.

Answer

Write on Account and Assign on Contact.

Answer

Append on Contact, with Share on Account to permit the relationship.

Question 9

Power Automate run history shows the following outcome:

Process scope: Failed
Log failure scope: Succeeded
Overall run: Succeeded

The logging scope runs after Process fails or times out. It records diagnostics but does not recover the business operation. Operations monitoring must identify the run as failed after those diagnostics are recorded. Which change makes the final status reflect that outcome?

Accepted Answer

End the logging branch with a Terminate action whose status is Failed.

Answer

Configure the logging scope to run only when the Process scope is successful.

Answer

Add a final Compose action containing the failed action's error message.

Answer

Increase the failed action's retry count while leaving the successful logging branch unchanged.

Question 10

A model-driven form already has an OnChange handler for new_discount that recalculates a displayed total. Manual edits run the handler correctly. A command instead executes the following code, which changes the discount but leaves the total unchanged:

const discount = formContext.getAttribute('new_discount');
discount.setValue(15);

The command must invoke the existing event logic without saving or refreshing the form. Which line belongs immediately after setValue?

Accepted Answer

discount.fireOnChange();

Answer

formContext.data.save();

Answer

formContext.data.refresh(false);

Answer

formContext.ui.refreshRibbon();

Free PL-400 Practice Questions

Domain 1: Create a technical design (10-15%)

Question 1

Domain 2: Build Power Platform solutions (10-15%)

Question 2

Question 3

Domain 3: Implement Power Apps improvements (10-15%)

Question 4

Domain 4: Extend the user experience (10-15%)

Question 5

Question 6

Domain 5: Extend the platform (30-35%)

Question 7

Question 8

Question 9

Domain 6: Develop integrations (10-15%)

Question 10

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