NoSQL DATA-SCIENCE-OPTIMIZE Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A data pipeline uses Apache Spark to process streaming data from Kafka and needs to store the results in a NoSQL database for real-time dashboards. The results are keyed by a metric ID and need to be updated frequently. Which NoSQL database is best suited for this integration?

   • ANeo4j
   • BApache Hive
   • CApache Kafka
   • DApache Cassandra
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A financial application uses a NoSQL database to store account balances. When a user transfers money, the system must ensure that the balance is never negative and that concurrent transfers do not cause inconsistencies. Which consistency model is required for this use case?

   • AEventual consistency
   • BStrong consistency with transactions
   • CCausal consistency
   • DRead-your-writes consistency
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   Which NoSQL data model stores data as collections of fields and values, often in formats like JSON or BSON, and is well-suited for applications with varying attributes?

   • AColumn-family store
   • BDocument store
   • CKey-value store
   • DGraph database
   Reveal Solution Discussion Select an answer first
5. 4expert · hard

   A company is migrating from a relational database to a NoSQL database for a product catalog. The catalog has products with varying attributes, and the team needs to support queries like 'find all products in category X with price less than Y'. They also need to ensure that when a product is updated, all queries reflect the update immediately. Which NoSQL database and consistency model would best meet these requirements?

   • ADocument store with strong consistency
   • BKey-value store with eventual consistency
   • CColumn-family store with strong consistency
   • DGraph database with eventual consistency
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A retail company wants to store user session data for its e-commerce website. Each session record includes a session ID, user ID, timestamp, and a JSON payload of cart items and preferences. The data is write-heavy and rarely updated after creation. The team needs low-latency reads by session ID and does not require complex joins or transactions across sessions. Which NoSQL data model best fits this workload?

   • AKey-value store with the session ID as the key and the JSON payload as the value
   • BDocument store with each session as a document and an index on the user ID
   • CColumn-family store with a column family for each user and columns for each session
   • DGraph database with nodes for users and sessions and edges for relationships
   Reveal Solution Discussion Select an answer first