Mirror Replication Agent consists of a set of components that work together to propagate transactions from the mirror log devices to the Replication Server.
Figure 1-4 shows the flow of transaction data through a Mirror Replication Agent during normal (transaction replicating) operation.
Figure 1-4: Mirror Replication Agent transaction data flow
The main Mirror Replication Agent components are:
Log Reader – reads the primary database transaction log on mirror log devices to retrieve transactions for replication, generates change-set data, and passes change sets to the Log Transfer Interface component.
Log Transfer Interface (LTI) – processes change-set data from the Log Reader, generates Log Transfer Language (LTL) commands, and sends the LTL commands and data to the Replication Server.
Log Transfer Manager (LTM) – manages all other components, coordinates their operations and interactions, and processes any errors reported by other components.
