Implement Data Access by Using Azure Cosmos DB for NoSQL SDKs DP-420 Practice Questions (Page 5)

Questions 21–25

1. 21expert · medium

   A developer is building a REST API that returns a paginated list of orders from Azure Cosmos DB for NoSQL. The API must allow clients to request the next page by passing a token. The developer wants to avoid exposing internal continuation tokens to clients. What should the developer do?

   • ALoad all results into memory and page them server-side.
   • BUse OFFSET and LIMIT in the query to implement pagination.
   • CReturn the continuation token as an opaque string in the response and accept it in the next request.
   • DUse a stored procedure to generate page tokens.
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2. 22expert · hard

   A developer is using the Azure Cosmos DB .NET SDK to perform a bulk upsert of 100,000 items. The operation is failing with 429 status codes, and the SDK's default retry policy is not sufficient. The developer wants to implement a custom retry strategy that respects the service's RetryAfter value. What should the developer do?

   • ACatch CosmosException with StatusCode 429 and retry after the RetryAfter value from the response.
   • BIgnore 429s and continue with the next item.
   • CIncrease the container's RU/s to avoid 429s.
   • DUse a fixed delay of 5 seconds between retries.
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4. 23application · medium

   A data migration tool must load 2 million historical sensor readings into an Azure Cosmos DB for NoSQL container. The container is partitioned by deviceId. The tool currently uses a loop that calls CreateItemAsync for each reading, and the migration is too slow. The developer wants to maximize throughput while keeping the code simple. What should the developer do?

   • AUse a transactional batch for every 100 items.
   • BUse a stored procedure to insert multiple items per execution.
   • CUse the BulkSupport property on the CosmosClient and add items to a list, then call CreateItemsAsync.
   • DIncrease the RU/s on the container and keep the loop of CreateItemAsync calls.
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5. 24foundation · easy

   What is the purpose of query metrics in Azure Cosmos DB?

   • ATo enforce the consistency level for the query.
   • BTo automatically tune the query to use fewer RUs.
   • CTo display the results of the query in a formatted table.
   • DTo provide detailed information about query execution, such as RU consumption and execution time, to help optimize performance.
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6. 25expert · hard

   A multi-tenant SaaS app uses Azure Cosmos DB for NoSQL with Session consistency. Each tenant's data is isolated by partition key. The app runs in multiple regions for disaster recovery. A user writes an item in the primary region, then reads it from a replica region. The read does not see the write. The developer wants to ensure that the user's subsequent reads see the write without forcing all reads to Strong consistency. What should the developer do?

   • AUse a custom synchronization mechanism to wait for replication.
   • BChange the account's default consistency to Strong.
   • CUse a change feed to replicate the write to the replica region.
   • DUse the session token from the write response in the read request options.
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