Which NoSQL database is known for scalability and high availability across multiple nodes?

• A. Cassandra
• B. MongoDB
• C. Oracle NoSQL
• D. Microsoft Azure Cosmos DB

Answer: (A)

Cassandra is known for its remarkable scalability and high availability, making it a popular choice for applications that require robust data handling across multiple nodes. It utilizes a distributed architecture that allows data to be spread across various servers, which means that it can efficiently manage large volumes of data while maintaining performance as the system scales. This architecture not only helps in balancing the load but also ensures that even if one node fails, the system as a whole remains operational, providing continuous availability.

Cassandra's use of a masterless design allows any node to accept data, which further enhances its ability to scale horizontally. As more nodes are added, the system can manage an even larger workload without compromising on performance. This characteristic is especially beneficial for businesses that anticipate rapid growth or fluctuating workloads, as it provides the flexibility to expand resources as needed without causing downtime.

In contrast, while other databases mentioned, such as MongoDB, Oracle NoSQL, and Microsoft Azure Cosmos DB, have their own strengths in terms of scalability and availability, they may not achieve the same level of performance and resiliency under heavy loads or across distributed environments as Cassandra does. Each has different mechanisms for data redundancy, replication, and consistency, but Cassandra's design fundamentally prioritizes high write and read throughput