Which feature does Alibaba Cloud Data Transmission Service (DTS) provide that Redis-shake does not?

The correct answer highlights a key capability of Alibaba Cloud Data Transmission Service (DTS), which is two-way data synchronization. This feature allows data to be synchronized bidirectionally between two databases, making it particularly useful in scenarios where changes need to be reflected in both systems in real-time. Two-way synchronization is essential for maintaining data consistency across different environments, especially in applications that require redundancy or load balancing across multiple database instances.

Redis-shake primarily focuses on data migration and replication for Redis databases. It does not inherently offer two-way data synchronization features, as its design is more centered around extracting and migrating data rather than maintaining a synchronized state between two databases. This functionality is crucial for scenarios where operations occur on both sides of the system and require immediate reflection.

In contrast to DTS's two-way capability, the other features mentioned, such as high availability, data backup, and data encryption, are also important but are not unique to DTS when compared to Redis-shake. Both services incorporate varying levels of high availability, data protection, and security features, but two-way synchronization clearly distinguishes DTS in this context.