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MB-920 Practice Question: The Dynamics 365 Commerce administrator for a…
You are the Dynamics 365 Commerce administrator for a retail chain with 50 stores. The company recently deployed the Commerce Scale Unit (CSU) with an onsite database for each store to support offline operations. During a routine check, you notice that one store's CSU database has not synchronized with the headquarters for the past 24 hours, and the store manager reports that some transactions are failing with a 'database connection error'. You verify that the store's internet connection is active and the CSU service is running. However, the Async Client service shows a status of 'Stopped' on the store's POS server. What should you do first to resolve the issue?
⚠ Common exam trap
Many exam-takers assume a network or configuration issue (options C or D) because the internet is active and the CSU is running, but the specific symptom of a stopped Async Client service directly points to a local service failure that requires a restart, not a deeper infrastructure change.
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
✓
Restart the Async Client service on the store's POS server
The Async Client service is responsible for synchronizing data between the store's Commerce Scale Unit (CSU) and the headquarters. When this service is in a 'Stopped' state, it cannot process the Commerce Data Exchange (CDX) jobs that push transactions and pull master data, causing the database to fall out of sync and leading to transaction failures due to stale or missing data. Restarting the Async Client service is the immediate corrective action because it re-establishes the communication channel without requiring reconfiguration or reinstallation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Restart the Async Client service on the store's POS server
Why this is correct
Restarting the service will resume the sync process and likely clear the error.
- ✗
Create a new Commerce Data Exchange session in the back office
Why it's wrong here
Creating a new session is not the immediate fix; the service needs to be running.
- ✗
Reconfigure the Async Client endpoint URLs in the CSU configuration
Why it's wrong here
The URLs are likely correct since the service worked before; this is more of a service restart issue.
- ✗
Reinstall the Commerce Scale Unit on the store's server
Why it's wrong here
Reinstalling is drastic and not necessary; the issue is a stopped service.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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