Can you explain the principle of asynchronous database replication?

Asynchronous database replication works on the principle that changes on the primary server (master) are sent to replicas (slaves) with a delay, meaning not in real-time. The primary server writes transactions to a log, and replicas periodically read these logs and apply changes to their data copies.

This means that replicas can lag behind the master for some time, but the load on the primary server is reduced because it does not wait for confirmation from replicas to complete transactions. This approach increases performance and scalability but requires considering possible data delay when reading from replicas.