Design and Implement a Non-Relational Data Model for Azure Cosmos DB for NoSQL DP-420 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which of the following is an example of a data access pattern that would influence the decision to embed related data in a single document?

   • AThe application always retrieves a blog post together with its comments.
   • BThe comments are stored in a separate container for analytics.
   • CThe application frequently updates the comments independently of the blog post.
   • DThe blog post and comments are rarely accessed together.
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2. 7foundation · easy

   Which of the following is a common way to implement a reference between two documents in Azure Cosmos DB?

   • AUsing a SQL JOIN to link the documents at query time.
   • BCreating a foreign key constraint between the two documents.
   • CStoring a copy of the entire related document inside the referencing document.
   • DStoring the id of the related document in a property of the referencing document.
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4. 8foundation · easy

   What is the most important characteristic of a good partition key in Azure Cosmos DB?

   • AIt has a high cardinality and distributes request units (RUs) evenly across partitions.
   • BIt is a string property that is easy to read and remember.
   • CIt is a system-generated property such as _rid.
   • DIt is the same for all items in the container.
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5. 9application · medium

   A food-delivery platform stores orders and the items within each order. The team wants to store order headers and order line items in the same container so that a single point read can fetch an entire order. The most frequent query filters by customerId and then by orderDate. Which partition key design best supports this access pattern?

   • APartition key = /type, where type is 'order' or 'item'
   • BPartition key = /orderId, with order header and items sharing the same orderId
   • CPartition key = /customerId, with an item type discriminator field
   • DPartition key = /orderDate, with a synthetic key combining customerId and orderId
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6. 10foundation · easy

   Why is it important to analyze data access patterns before designing a non-relational data model in Azure Cosmos DB?

   • ATo determine the most efficient way to structure data so that common queries can be served with minimal request units (RUs).
   • BTo ensure that all documents have exactly the same schema.
   • CTo decide which indexing policy to use, but it has no impact on data modeling.
   • DTo guarantee that the data model is normalized to the third normal form.
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