Design and Implement Multi-Region Writes DP-420 Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A company uses Azure Cosmos DB for NoSQL with multi-region writes. The application stores order data. The company wants to use a custom conflict resolution policy that merges conflicting documents. The development team has written a stored procedure and wants to test it. What should you do to test the conflict resolution policy?

   • AUse the .NET SDK to call the stored procedure directly.
   • BSimulate a conflict by writing the same document to two different regions simultaneously and then query the conflict feed.
   • CUse the Azure portal to run the stored procedure against a sample document.
   • DEnable multi-region writes and then use the change feed to verify the merge.
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2. 2expert · hard

   A company is evaluating whether to enable multi-region writes for an existing Azure Cosmos DB for NoSQL account. The account currently has two read regions and one write region. The application is used by customers in those regions. The company wants to reduce write latency for customers in the read regions. What should you do?

   • AEnable multi-region writes on the account.
   • BConfigure the SDK to use the nearest region for writes.
   • CAdd more read regions to the account.
   • DUse the Azure Cosmos DB gateway to route writes to the nearest region.
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4. 3application · medium

   A healthcare application uses Azure Cosmos DB for NoSQL with multi-region writes. The application stores patient records. When a patient record is updated concurrently in two regions, the company wants to merge the changes: for example, if one region updates the phone number and another updates the address, the final document should contain both updates. Which conflict resolution approach should you implement?

   • AUse the built-in 'merge' conflict resolution policy.
   • BConfigure the application to retry writes until no conflict occurs.
   • CUse the default last-writer-wins policy with the _ts timestamp.
   • DConfigure a custom conflict resolution policy with a stored procedure that merges the conflicting documents.
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5. 4foundation · easy

   Which scenario is most appropriate for enabling multi-region writes in Azure Cosmos DB?

   • AA single-region application that needs to reduce storage costs.
   • BA global application with users in multiple geographic regions that requires low write latency in each region.
   • CAn application that requires strong consistency for all read operations.
   • DAn application that only needs to read data from multiple regions and writes from a single region.
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6. 5foundation · easy

   When using a custom conflict resolution policy in Azure Cosmos DB, what is the role of the stored procedure?

   • AIt is used to delete conflicting items from the container.
   • BIt is executed to merge conflicting items and produce a single winning version.
   • CIt is used to change the consistency level of the container.
   • DIt is used to log conflicts to a separate collection.
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