nosql quizz 2

What is the primary purpose of the Map phase in MapReduce?

• To combine the intermediate data into final results

• To process the data and generate key-value pairs

• To perform sorting and shuffling of data

• To load the input data

In the context of MapReduce, what does the Reduce phase do?

• Aggregates intermediate key-value pairs into the final result

• Splits the input data into smaller chunks

• Filters data that does not match the criteria

• Prepares data for Map processing

In a MapReduce program, the intermediate data generated after the Map phase is:

• Stored in the database directly.

• Sent to the user for processing.

• Shuffled and sorted before being sent to the Reduce phase.

• Used to generate input splits for the Map phase.

You are designing a high-performance system that requires frequent updates to user session data and needs to store additional metadata about each session. Which of the following considerations could make a key-value database less suitable for this use case?

• Lack of support for relational queries

• Limited ability to handle hierarchical or structured data within a single key

• Poor scalability for distributed systems

• Overhead in retrieving values by key

Which of the following query languages is used in Neo4j?

• SQL

• CQL

• Cypher

• JSON

Which type of NoSQL database is best suited for hierarchical data?

• Graph database

• Document store

• Key-value store

• Column family store

Which use case is best suited for a graph database?

• Complex join operations in relational data

• Hierarchical data representation

• Analyzing social network connections

• Handling large-scale transactional data

In a graph database, which scenario might lead to inefficiency during query execution?

• When there are too many nodes

• When relationships are not indexed properly

• When properties are added to relationships

• When nodes have unique identifiers

Which scenario demonstrates a potential disadvantage of a graph database compared to a relational database?

• Analyzing complex relationships between entities

• Performing joins between multiple data sets

• Handling large volumes of transactional data with strict constraints

• Representing hierarchical data structures

What is a common graph traversal algorithm?

• Dijkstra's algorithm

• Binary search

• Merge sort

• Quicksort