Data Storage

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.

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.

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.