NoSQL DATA-SCIENCE-OPTIMIZE Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which NoSQL data model is most appropriate for analyzing social network connections and finding the shortest path between users?

   • AKey-value store
   • BDocument store
   • CColumn-family store
   • DGraph database
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A startup is building a content management system where articles have a flexible schema: some have authors, tags, and images, while others have additional custom fields. The team expects the schema to evolve frequently. They need to store and query these articles efficiently. Which type of database is most appropriate?

   • AKey-value store with article ID as key
   • BDocument store like MongoDB
   • CRelational database with a fixed schema
   • DGraph database with articles and tags as nodes
   Reveal Solution Discussion Select an answer first
4. 13expert · hard

   A company runs a Hadoop cluster with HDFS and uses Hive for batch ETL. They also have a real-time dashboard that needs to display data from the same source. The team wants to use a single NoSQL database to serve both batch processing and real-time queries. They are considering Apache HBase. What is the main trade-off they should consider?

   • AHBase provides strong consistency, which is incompatible with Hadoop's eventual consistency model
   • BHBase is a column-family store, so it cannot integrate with Hive or Spark
   • CHBase provides low-latency random access but is not optimized for full-table scans that Hive typically performs
   • DHBase is not a NoSQL database and cannot be used with Hadoop
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   A company uses Cassandra to store user activity logs. The logs are written by multiple application servers and read by an analytics team for reporting. The analytics team occasionally sees missing recent logs when querying, but the logs appear later. The team is concerned about data loss. What is the most likely cause and the appropriate action?

   • AThe reads are hitting replicas that have not yet received the writes due to eventual consistency; the team should use a higher consistency level for reads, such as QUORUM
   • BThe application servers are not using a partition key; the team should add a partition key
   • CThe analytics team is querying with a consistency level of ALL, which is causing timeouts
   • DThe logs are being deleted by a TTL (time-to-live) setting; the team should increase the TTL
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   What does eventual consistency mean in a NoSQL database?

   • AAll transactions must be atomic and isolated across the entire cluster.
   • BUpdates are immediately visible to all reads across all replicas.
   • CIf no new updates are made, all replicas will eventually converge to the same value.
   • DReads always return the most recent write, even during network partitions.
   Reveal Solution Discussion Select an answer first