MB-920 Describe Dynamics 365 Commerce Practice Question
This MB-920 practice question tests your understanding of describe dynamics 365 commerce. 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.
Contoso Retail is a mid-sized company with 50 physical stores and an online store. They use Dynamics 365 Commerce. Recently, they launched a promotion offering 20% off on all electronics for a weekend. During the promotion, the online store experienced slow page load times, and some customers reported errors when adding items to the cart. The IT team checked the infrastructure and found that the Retail Server CPU usage was at 95%, and the channel database had high lock contention. The POS systems in stores were working fine. The company uses a single Retail Server instance and a single channel database for all channels. What is the best course of action to prevent this issue in future promotions?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Scale out the Retail Server and channel database to handle increased load.
The issue stems from a single Retail Server and single channel database being overwhelmed by the combined load of online and POS traffic during the promotion. Scaling out the Retail Server (e.g., adding more instances behind a load balancer) and the channel database (e.g., using a dedicated online channel database or scaling up/out the existing one) directly addresses the high CPU usage and lock contention, ensuring adequate capacity for future high-traffic events.
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.
✗
Disable the online store during promotions to ensure POS performance.
Why it's wrong here
This would lose online sales.
✓
Scale out the Retail Server and channel database to handle increased load.
Why this is correct
Adding more resources will improve performance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the online store to use offline mode.
Why it's wrong here
Offline mode is for POS, not for the online store.
✗
Reduce the promotion discount to 10% to lower traffic.
Why it's wrong here
This is a business decision, not a technical fix.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think the issue is client-side (e.g., POS or offline mode) or can be solved by reducing demand, rather than recognizing that the bottleneck is server-side capacity (Retail Server and channel database) that must be scaled to match peak load.
Detailed technical explanation
How to think about this question
In Dynamics 365 Commerce, the Retail Server handles all business logic and data operations for both online and POS channels, while the channel database stores product catalogs, inventory, and transaction data. High lock contention in the channel database often occurs when multiple concurrent requests (e.g., from online shoppers) try to update or read the same records, such as inventory levels. A common real-world pattern is to deploy a separate channel database for the online store to isolate workloads, combined with multiple Retail Server instances behind a load balancer to distribute CPU-bound requests.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
Describe Dynamics 365 Commerce — This question tests Describe Dynamics 365 Commerce — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Scale out the Retail Server and channel database to handle increased load. — The issue stems from a single Retail Server and single channel database being overwhelmed by the combined load of online and POS traffic during the promotion. Scaling out the Retail Server (e.g., adding more instances behind a load balancer) and the channel database (e.g., using a dedicated online channel database or scaling up/out the existing one) directly addresses the high CPU usage and lock contention, ensuring adequate capacity for future high-traffic events.
What should I do if I get this MB-920 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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