Design and Implement a Non-Relational Data Model for Azure Cosmos DB for NoSQL DP-420 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   In Azure Cosmos DB, what is the scope of uniqueness for the id property within a container?

   • AUnique only if a unique key policy is defined.
   • BUnique across the entire container regardless of partition key.
   • CUnique across all containers in the database.
   • DUnique within each logical partition, meaning the combination of partition key and id must be unique.
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2. 2application · medium

   A legal document management system stores contracts. The application must maintain a full history of every change to a contract, and users must be able to retrieve any previous version. The team wants to avoid losing data and keep the current version fast to read. Which design should they use?

   • AStore only the latest version and keep backups of the container.
   • BOverwrite the same document with each new version and rely on the change feed to capture history.
   • CStore each version as a separate document with a version number in the id, and keep a pointer to the current version in a metadata document.
   • DEmbed all versions in a single document as an array.
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4. 3foundation · easy

   Which of the following is a common approach to implementing document versioning in Azure Cosmos DB?

   • AStoring each version as a separate item with a version number in the id or a version property.
   • BEnabling the built-in versioning feature on the container.
   • COverwriting the document and relying on the _ts timestamp to recover old data.
   • DUsing the change feed to automatically store previous versions in a separate container.
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5. 4application · medium

   A social media app stores user profiles and posts. The timeline view needs to show each post with the author's display name and avatar URL. The team wants to avoid a second read per post. Which design should they implement?

   • AStore the authorId and use a SQL JOIN across the user and post containers.
   • BStore the author's display name and avatar URL inside each post document.
   • CStore only the authorId in the post and query the user container for each post.
   • DStore the authorId and use a change feed to update the post when the profile changes.
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6. 5foundation · easy

   What is the purpose of a unique key policy in Azure Cosmos DB?

   • ATo enforce uniqueness of a specified property or combination of properties within a logical partition.
   • BTo ensure that all items in a container have the same schema.
   • CTo automatically generate a unique id for each item.
   • DTo allow the same id to be used in different partitions.
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