Design and Implement a Non-Relational Data Model for Azure Cosmos DB for NoSQL DP-420 Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   Which of the following properties would be the best partition key for a container that stores orders for an e-commerce application?

   • AorderId (a unique GUID for each order)
   • BorderStatus (e.g., "pending", "shipped", "delivered")
   • CorderDate (the date the order was placed)
   • DcustomerId (the customer who placed the order)
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   What is the main advantage of embedding related entities (e.g., order items) directly within a parent document (e.g., an order) in Azure Cosmos DB?

   • AIt allows the related entities to be updated independently without affecting the parent document.
   • BIt automatically distributes the related entities across multiple partitions.
   • CIt eliminates the need to specify a partition key for the container.
   • DIt reduces the number of requests needed to read the parent and its related data.
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A multi-tenant application stores tenant configurations in a Cosmos DB container. Each configuration has a tenantId and a configurationName. The application must ensure that each tenant can have only one configuration with a given name. Which approach should they use?

   • AUse a unique key constraint on the tenantId field.
   • BUse a unique key constraint on the configurationName field.
   • CRely on a stored procedure to check for duplicates before insert.
   • DSet the document id to a concatenation of tenantId and configurationName.
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   When designing a container to store multiple entity types, which property is commonly used to distinguish between the different entity types in each item?

   • AThe _rid property
   • BA discriminator property such as "type" or "entityType"
   • CThe _ts property
   • DThe id property
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A news website stores articles and comments. The application displays an article with its most recent 10 comments. Users rarely view older comments. The team wants to optimize for this specific read pattern. Which design should they implement?

   • AEmbed all comments in the article document.
   • BStore all comments as separate documents and query by article ID.
   • CStore comments in a separate container and use a change feed to maintain a recent-comments array.
   • DEmbed the most recent 10 comments in the article document and store older comments as separate documents.
   Reveal Solution Discussion Select an answer first