Final answer:
The data replication strategy where changes are immediately saved to a secondary system with a timestamp is known as Real-time replication. It's used for systems requiring instant data replication for high availability.
Step-by-step explanation:
The data replication strategy where all data changes are date stamped and saved to a secondary system as the changes are happening is called Real-time replication. The data replication strategy where changes are immediately saved to a secondary system with a timestamp is known as Real-time replication. It's used for systems requiring instant data replication for high availability. This approach is typically used in systems that require high availability and up-to-the-minute data accuracy.
As data is changed on the primary system, it is immediately replicated to the secondary system with a timestamp, ensuring a near-instantaneous copy. This differs from other strategies such as Snapshot replication, which replicates data at set intervals, Transactional replication, which is focused on consistency and atomic transaction replication, and Merge replication, which is designed to allow changes from multiple databases to be combined into a single database.