Replication system components

This section describes the components and resources that must be present or assembled before you can run Replication Server. Refer to the Replication Server Design Guide for component requirements and performance considerations of different replication topologies.

Figure 2-1 illustrates a simple configuration for a WAN-based distributed database system based on Replication Server.

Figure 2-1: Replication Server plug-in

Table 2-1 lists the replication system components.

**Table 2-1: Replication system components**
Component	Required/ optional	Description
Replication Server	Required	Coordinates data replication with local databases and exchanges messages with other Replication Servers. Includes ID Server.
Data Source	Required	Adaptive Server, SQL Server, or other data server. Includes: Replication agent RSSD (Adaptive Server or SQL Server)
Client Applications	Optional	Update primary database, query replicate database.
Sybase Central	Recommended	Includes Replication Server Manager client and server components.

Each component uses the Open Client/Server Interface to communicate with other components.

The remainder of this section describes each component.