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Prepare the data →mediumMultiple ChoiceObjective-mapped

PL-300 Prepare the data Practice Question

This PL-300 practice question tests your understanding of prepare the data. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Exhibit

Refer to the exhibit.

```json
{
  "workspaceId": "12345678-1234-1234-1234-123456789012",
  "dataflowId": "87654321-4321-4321-4321-210987654321",
  "dataflowName": "SalesDataflow",
  "entities": [
    {
      "name": "Sales",
      "source": "AzureSqlDatabase",
      "refreshPolicy": {
        "type": "Full",
        "interval": "Daily"
      }
    },
    {
      "name": "Product",
      "source": "SharePointList",
      "refreshPolicy": {
        "type": "IncrementalRefresh",
        "interval": "Hourly",
        "incrementalGranularity": "Day"
      }
    }
  ]
}
```

You are examining a Power BI dataflow configuration. The dataflow is scheduled to refresh the 'Sales' entity daily and the 'Product' entity hourly. However, the 'Product' entity refresh fails every hour with an error indicating the SharePoint list data source is not accessible. You need to diagnose the issue. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Exhibit

Refer to the exhibit.

```json
{
  "workspaceId": "12345678-1234-1234-1234-123456789012",
  "dataflowId": "87654321-4321-4321-4321-210987654321",
  "dataflowName": "SalesDataflow",
  "entities": [
    {
      "name": "Sales",
      "source": "AzureSqlDatabase",
      "refreshPolicy": {
        "type": "Full",
        "interval": "Daily"
      }
    },
    {
      "name": "Product",
      "source": "SharePointList",
      "refreshPolicy": {
        "type": "IncrementalRefresh",
        "interval": "Hourly",
        "incrementalGranularity": "Day"
      }
    }
  ]
}
```

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The refresh interval is too frequent for the incremental granularity of 'Day'

Option A is correct because the 'Product' entity is scheduled to refresh hourly, but if the dataflow has an incremental refresh policy set to a daily granularity (which is common to optimize performance), the hourly refresh tries to re-query the entire day's data each time. This excessive load on the SharePoint list can cause timeouts or errors that appear as 'data source not accessible'. The mismatch between the refresh frequency and the incremental granularity is the most likely cause, as the source cannot handle the repeated full scans.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    The refresh interval is too frequent for the incremental granularity of 'Day'

    Why this is correct

    Hourly refresh with daily granularity can cause overlapping partitions and high load.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Incremental refresh is not supported for SharePoint list data sources

    Why it's wrong here

    Power BI supports incremental refresh for SharePoint lists.

  • ✗

    The workspace ID is missing from the dataflow configuration

    Why it's wrong here

    The workspace ID is present in the exhibit.

  • ✗

    The on-premises data gateway is not configured for the SharePoint list

    Why it's wrong here

    SharePoint Online is a cloud source and does not require a gateway.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The most common error is to assume the issue is related to the data gateway or an unsupported data source type. However, the real problem is that the SharePoint list cannot handle the hourly refresh frequency, likely due to throttling or query limits. This is reflected in option A, which points to the refresh interval being too frequent for the source.

Detailed technical explanation

How to think about this question

In Power BI dataflows, incremental refresh works by partitioning data based on a date/time column and only refreshing the partitions that fall within the defined range (e.g., last 30 days). When the refresh frequency (e.g., hourly) is shorter than the incremental period (e.g., day), the engine may attempt to re-query the entire partition each time, causing excessive load on the source. SharePoint Online lists have API throttling limits (e.g., 300 requests per minute per app principal), and repeated full scans can trigger HTTP 429 or 503 errors, which Power BI may surface as 'data source not accessible'.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PL-300 question test?

Prepare the data — This question tests Prepare the data — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The refresh interval is too frequent for the incremental granularity of 'Day' — Option A is correct because the 'Product' entity is scheduled to refresh hourly, but if the dataflow has an incremental refresh policy set to a daily granularity (which is common to optimize performance), the hourly refresh tries to re-query the entire day's data each time. This excessive load on the SharePoint list can cause timeouts or errors that appear as 'data source not accessible'. The mismatch between the refresh frequency and the incremental granularity is the most likely cause, as the source cannot handle the repeated full scans.

What should I do if I get this PL-300 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 24, 2026

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This PL-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-300 exam.