Data Storage test - Big Data Scientist questions

Question 1

What is the difference between a key-value store database and a column-family store database?

A key-value store database only stores simple key/value pairs, whereas a column-family store database stores data grouped by column families A key-value store database stores data in tables, while a column-family store database does not use table formats A key-value store is best used for analyzing large amounts of data, while column-family storage is better used for smaller amounts of data There is no difference between a key-value store database and a column-family store database A key-value store database stores data grouped by column families, whereas a column-family store database only stores simple key/value pairs

Correct Answer: A key-value store database only stores simple key/value pairs, whereas a column-family store database stores data grouped by column families

A key-value store database is best used for simple queries with low latency requirements. On the other hand, column-family store databases are a better choice for analytical queries that require complex analysis on large datasets.

Question 2

What is data replication in data storage?

The process of encrypting data for security purposes The process of creating one or more copies of the same data and storing them on different storage systems or locations to ensure data availability and redundancy The process of compressing data to save storage space The process of deleting unused data to free up storage space The process of dividing data into smaller parts and distributing them across multiple servers The process of backing up data to an external storage device

Correct Answer: The process of creating one or more copies of the same data and storing them on different storage systems or locations to ensure data availability and redundancy

Data replication involves creating multiple copies of data to ensure data availability, redundancy, and fault tolerance. This allows organizations to maintain business continuity in the event of a data loss, hardware failure, or disaster. Replicated data can be stored on different storage systems or locations, such as on-premise servers, cloud-based servers, or geographically dispersed data centers.

Question 3

What is data sharding in data storage?

It is a technique used to vertically partition databases. It is the technique used to horizontally partition large databases into smaller, more manageable parts. It is a method used to replicate data across multiple nodes. It is the process of compressing data for storage optimization. It is the process of moving data to a cold storage for long-term retention. It is a method used to index data in a database.

Correct Answer: It is the technique used to horizontally partition large databases into smaller, more manageable parts.

Data sharding is a method used to horizontally partition large databases into smaller, more manageable parts. This helps to distribute data across multiple nodes, improving scalability and performance. Vertical partitioning involves dividing a table into smaller, more focused parts.

Data Storage

Big Data Scientist - Data Storage Example Questions

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