Cassandra Practice Test

Choosing the consistency level that guarantees a read operation always returns the most recently written value is essential for maintaining data accuracy and integrity within a distributed database like Cassandra. The option that provides this guarantee is 'All.' When using the 'All' consistency level, every replica node must acknowledge a read operation before it can complete. This means that the read request does not return until every single replica has been queried, ensuring that the most recent write is visible across all nodes. This level of consistency ensures that there are no stale reads, as the operation waits for the latest data from all replicas. Other consistency levels, while they offer varying degrees of reliability, do not ensure the same level of immediacy in reflecting the latest writes. For instance, a lower consistency level like 'One' only requires acknowledgment from a single replica, potentially resulting in reading outdated values if a write has not yet propagated to that node. 'Quorum' requires a majority of replicas to respond but may still allow for scenarios where the most recent write is not seen, especially in cases of transient states during data propagation. 'Eventual' consistency operates under the principle that, over time, all replicas will converge to the same state, but it does not guarantee that a read at any point