Which of the following is NOT a feature of Alibaba Cloud's Cassandra database service?

The assertion that the Cassandra database service on Alibaba Cloud provides strong consistency aligns with its design principles. In fact, Cassandra is characterized by its eventual consistency model rather than strong consistency. This means that while it is highly available and partition tolerant, it does not guarantee immediate consistency across all nodes after a write operation. Instead, the system ensures that data will eventually become consistent. This allows it to perform well in distributed scenarios where availability and partition tolerance are prioritized over immediate consistency.

The other features mentioned highlight the capabilities of the Cassandra service. It indeed supports multiple data models, allowing users to leverage the flexibility of different data structures. Additionally, it accommodates both narrow and wide tables, making it adaptable to various use cases. Finally, it enables flexible schema functions that let users define their data structures according to the demands of their application, further emphasizing the database’s versatility.