- A
Re-publish the Power BI report from Power BI Desktop.
Why wrong: Re-publishing does not update gateway credentials; it only pushes the report.
- B
Update the data source credentials in the gateway settings in Power BI Service.
The stored credentials might be expired or incorrect; updating them in the service can resolve the issue.
- C
Verify that the gateway machine can connect to the Oracle server and that the Oracle client is installed.
Network connectivity and proper Oracle client installation are prerequisites for successful data refresh.
- D
Edit the data source settings in Power BI Desktop and republish.
Why wrong: Gateway data source settings are managed in the service, not in Desktop.
- E
Reinstall the on-premises data gateway.
Why wrong: Reinstalling is a drastic step and usually not needed; the issue is with credentials, not the gateway software.
Quick Answer
The correct answer involves two steps: updating the data source credentials in the Power BI Service gateway settings and verifying that the gateway machine has the Oracle client installed and can connect to the Oracle server. This resolves the "Power BI Oracle gateway credentials invalid" error because the scheduled refresh failure typically means the stored credentials in the service are no longer valid or the gateway lacks the necessary software to authenticate with the Oracle database. On the PL-300 exam, this scenario tests your understanding of on-premises gateway configuration and data source credential management, often appearing as a troubleshooting question where candidates mistakenly focus only on the gateway status or the Oracle server itself. A common trap is assuming the gateway installation alone is sufficient, forgetting that the Oracle client (like ODAC or ODP.NET) must be present on the gateway machine. Remember the mnemonic "C&C" — Credentials and Client — to always check both the stored credentials in the service and the Oracle client connectivity on the gateway host.
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.
You are connecting to an on-premises Oracle database from Power BI Service. The gateway is installed and configured. However, the scheduled refresh fails with an error indicating that the data source credentials are invalid. Which TWO steps should you take to resolve the issue? (Choose two.)
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
Update the data source credentials in the gateway settings in Power BI Service.
Option B is correct because the scheduled refresh failure indicates that the stored credentials for the on-premises Oracle data source in Power BI Service are invalid. You must update the data source credentials in the gateway settings under 'Manage gateways' in Power BI Service to provide a valid username and password that the gateway can use to authenticate against the Oracle database. Option C is correct because the gateway machine requires the Oracle client software (e.g., Oracle Data Access Components or ODP.NET) to be installed and configured, and the gateway must have network connectivity to the Oracle server; verifying these ensures the gateway can reach and authenticate with the database.
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.
- ✗
Re-publish the Power BI report from Power BI Desktop.
Why it's wrong here
Re-publishing does not update gateway credentials; it only pushes the report.
- ✓
Update the data source credentials in the gateway settings in Power BI Service.
Why this is correct
The stored credentials might be expired or incorrect; updating them in the service can resolve the issue.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Verify that the gateway machine can connect to the Oracle server and that the Oracle client is installed.
Why this is correct
Network connectivity and proper Oracle client installation are prerequisites for successful data refresh.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Edit the data source settings in Power BI Desktop and republish.
Why it's wrong here
Gateway data source settings are managed in the service, not in Desktop.
- ✗
Reinstall the on-premises data gateway.
Why it's wrong here
Reinstalling is a drastic step and usually not needed; the issue is with credentials, not the gateway software.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume re-publishing or editing the report in Power BI Desktop will propagate credential changes to the gateway, but Power BI Service stores credentials independently for scheduled refresh, and only updating them in the gateway settings resolves the issue.
Detailed technical explanation
How to think about this question
The on-premises data gateway uses a stored credential set (encrypted with the gateway's encryption key) to connect to the Oracle database via the Oracle client libraries (e.g., tnsnames.ora or Easy Connect). When the scheduled refresh fails with 'invalid credentials,' it means the gateway's attempt to authenticate against the Oracle server using those stored credentials was rejected—often due to a password change or an expired account. The gateway does not automatically sync credentials from Power BI Desktop; you must manually update them in the Power BI Service gateway settings, and the gateway machine must have the correct Oracle client version (e.g., 64-bit) and network access to the Oracle listener on the specified port (default 1521).
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: Update the data source credentials in the gateway settings in Power BI Service. — Option B is correct because the scheduled refresh failure indicates that the stored credentials for the on-premises Oracle data source in Power BI Service are invalid. You must update the data source credentials in the gateway settings under 'Manage gateways' in Power BI Service to provide a valid username and password that the gateway can use to authenticate against the Oracle database. Option C is correct because the gateway machine requires the Oracle client software (e.g., Oracle Data Access Components or ODP.NET) to be installed and configured, and the gateway must have network connectivity to the Oracle server; verifying these ensures the gateway can reach and authenticate with the database.
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.
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
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.
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