SAP Replication System Components

The replication system components are described by their function and role in an SAP replication system.

• Primary Data Server
  A primary data server manages one or more primary databases, which are the sources of the data-changing operations or transactions in a replication system. The primary data server is configured to capture information needed for replication.
• Replication Agent
  Replication Agent transfers transaction information, which represents changes made to data schemas and execution of stored procedures, from a primary data server to a Replication Server, for distribution to other (replicate) databases.
• Replication Server
  The Replication Server at each primary or replicate site coordinates data replication activities for local data servers and exchanges data with Replication Servers at other sites.
• Replication Server System Database (RSSD)
  The Replication Server System Database (RSSD) is a database that contains the Replication Server system tables.
• Database Gateway
  Database gateway allows clients using one communication protocol to connect with data servers that use a different protocol.
• ExpressConnect for Oracle
  ExpressConnect for Oracle provides direct communication between Replication Server and a replicate Oracle data server.
• ExpressConnect for SAP HANA Database
  ExpressConnect for SAP HANA® database is an embedded library loaded by SAP Replication Server for replication to SAP HANA database.
• Replicate Data Server
  Replicate data server manages a database that contains replicate data, which is data that is a “copy” of the data in a primary database.