Progress Fathom Replication
User’s Guide

> ## Fathom Replication server

> For Fathom Replication to succeed in keeping the source and target databases identical, communication has to take place so that transaction log records from the source are propagated to the target. The Fathom Replication server connects to the source database and sends any updates made there to the Fathom Replication agent on the target machine or machines. Also, the Fathom Replication server process provides communications for startup, schema locks, and server-side recovery if a failure occurs.

> Figure 1–3 shows the Fathom Replication server in the Fathom Replication model.

> Figure 1–3: Fathom Replication server

> The Fathom Replication server must reside on the source database machine. The Fathom Replication server:

> - Connects to the source database and establishes and maintains communications with the database server.

> - Establishes, maintains, and controls communication with the Fathom Replication agents.

> - Sends source database updates to the target database to keep them identical. This is achieved by using the AI transaction log where AI blocks of information are sent to the target.

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