For OpenEdge Replication to succeed in keeping the source and target databases identical, communication must occur between the two databases, allowing propagation of transaction log records from the source to the target. The OpenEdge Replication server connects to the source database and sends any updates made there to the OpenEdge Replication agent on the target machine (or machines, if there are two target databases). Also, the OpenEdge Replication server process provides communications for startup, schema locks, and server-side recovery if a failure occurs.
The following figure highlights the OpenEdge Replication server in the OpenEdge Replication model.
Figure 4. OpenEdge Replication server
The OpenEdge Replication server:
Must reside on the source database machine.
Connects to the source database and establishes and maintains communications with the database server.
Establishes, maintains, and controls communication with the OpenEdge Replication agents.
Sends source database updates to the target database to keep the databases identical. This is achieved by using the AI transaction log to send AI blocks of information to the target.
Must reside on the source database machine.