US Patent 11176171 Controlling a multi-database system

A computer-implemented method for controlling a system is provided. The system includes a source database and a target database. The system can asynchronously replicate data changes of at least one part of the source database to the target database. This asynchronous replication includes evaluating, by a capture engine, a log of the source database for identifying any un-replicated data changes of the at least one part of the source database, transferring the identified data changes to an apply engine, and applying, by the apply engine, the transferred data changes to the target database.