What aspect does "eventual consistency" in BASE emphasize?

"Eventual consistency" in the context of BASE (Basically Available, Soft state, Eventual consistency) primarily emphasizes the idea that while the system may not be immediately consistent at all times, it will become consistent over time. This approach allows for high availability and performance, making it suitable for distributed systems where immediate synchronization across all nodes can be challenging.

By acknowledging that temporary inconsistency is acceptable, BASE systems prioritize immediate access to data even if it means that the data may not reflect the most recent updates instantaneously. The eventual consistency ensures that all updates will propagate through the system, and all replicas will converge to the same state eventually, thus achieving coherence without needing to ensure that every single operation is completed in real-time.

In contrast, immediate data synchronization and permanent consistency are characteristics found in more traditional ACID (Atomicity, Consistency, Isolation, Durability) databases, which require that transactions are processed reliably and consistently right away. Daily data checks are not related to the foundational principles of eventual consistency and do not encompass its dynamic nature. Thus, the focus on temporary inconsistency of data is what distinctly highlights the philosophy behind eventual consistency in BASE.