Cassandra Practice Test

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What is a key advantage of using Cassandra?

Single point of failure
Automatic data cleansing
Always-on reliability
Complex query support

The correct answer is: Always-on reliability

A key advantage of using Cassandra is its always-on reliability. Cassandra is designed to provide high availability and fault tolerance, which means it can operate continuously without downtime. This is achieved through its distributed architecture, where data is spread across multiple nodes. If one node fails, the system remains operational as the data is still accessible from other nodes. This characteristic makes Cassandra particularly suitable for applications that require constant access to data, such as online transactions and real-time analytics. The design also includes mechanisms for data replication and partitioning, ensuring that even in the event of hardware failures, data remains available and consistent. Other options do not align with the benefits provided by Cassandra; for instance, a single point of failure contradicts the distributed nature of Cassandra. Automatic data cleansing is not a primary feature of Cassandra, as it focuses more on data storage and management rather than automated data quality processes. Lastly, while Cassandra does support querying, it is not primarily known for complex query capabilities like SQL databases, as it is designed more for scalability and performance in distributed environments rather than for handling intricate queries.