Database Structure Types DS0-001 Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A social media platform uses a NoSQL database with eventual consistency to store user posts. A user posts a message and immediately refreshes their feed, but the post is not visible. The platform's product team wants to ensure that users always see their own posts immediately. Which consistency model should be implemented to address this without sacrificing the benefits of eventual consistency for other users?

   • AStrong consistency for all reads
   • BEventual consistency with a delay
   • CRead-your-writes consistency
   • DCausal consistency
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   Which of the following is a key feature of Amazon DynamoDB?

   • AIt provides built-in support for ACID transactions across multiple items
   • BIt is a fully managed relational database service
   • CIt is a serverless, key-value and document database that scales automatically
   • DIt requires manual provisioning of read and write capacity
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   An e-commerce company expects a sudden surge in traffic during a flash sale. Their current relational database is experiencing performance degradation. They need to handle the increased read and write load with minimal downtime and without changing their application's query patterns. Which approach is most appropriate?

   • AAdd read replicas and use a load balancer for read-heavy traffic
   • BMigrate to a NoSQL database to gain automatic horizontal scaling
   • CImplement sharding at the application layer to distribute writes across multiple relational instances
   • DScale up the existing database server with more CPU and memory
   Reveal Solution Discussion Select an answer first
5. 4expert · hard

   A distributed e-commerce system uses a NoSQL database with eventual consistency. During a flash sale, a user adds an item to their cart, but when they view the cart, the item is missing. The issue is traced to a replica lag. The team needs to ensure that a user's cart always reflects their own actions immediately, while still allowing eventual consistency for other users. What is the best solution?

   • AUse a cache to store the user's cart
   • BIncrease the replica count to reduce lag
   • CImplement read-your-writes consistency in the NoSQL database
   • DSwitch to a relational database with strong consistency
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   Which consistency model is typically associated with relational databases?

   • ACausal consistency
   • BEventual consistency
   • CStrong consistency
   • DRead-your-writes consistency
   Reveal Solution Discussion Select an answer first