Data Processing Computer-Based Test On Data-Processing 4

Question 1

In MapReduce, the 'shuffle and sort' phase occurs between:

Accepted Answer

Map and Reduce

Answer

After the Map phase, the shuffle and sort phase groups and sorts intermediate key-value pairs before they are sent to Reducers.

Question 2

Which data format is most commonly used for exchanging data between web services today?

Accepted Answer

JSON

Answer

JSON (JavaScript Object Notation) is the dominant format for REST APIs and web service data exchange due to its human-readable, lightweight structure.

Question 3

What is a 'data warehouse' primarily optimized for?

Accepted Answer

Long-term analytical queries over large historical datasets

Answer

Data warehouses use columnar storage and denormalized schemas to support complex analytical queries across large volumes of historical data.

Question 4

Which technique is used to split a large database table across multiple servers to improve scalability?

Accepted Answer

Sharding

Answer

Sharding horizontally partitions a table so each shard holds a subset of rows, distributing load across multiple nodes.

Question 5

In a computer-based data processing test, a 'data dictionary' serves as:

Accepted Answer

A centralized repository of metadata describing data elements, types, and relationships

Answer

A data dictionary documents the structure, meaning, and constraints of each data element within a system.

Data Processing Practice Test

Data Processing Practice Test

Data Processing Computer-Based Test On Data-Processing 4