Plan the Replication System

Obtain the information you require to plan the replication system you intend to install and configure.

• Primary and Replicate Data
  Primary data is the set of data that is replicated from a source—the primary database, to another database—the replicate database, through the replication system. The set of data replicated from the primary database to the replicate database is the replicate data. The primary database is known to all of the Replication Servers with subscriptions for the data.
• Required Replication Servers
  When you design a replication system, you decide how many Replication Servers will be installed, which databases they will manage, and on which machine they will execute.
• Replication Server System Database Location
  Replication system data is stored in a dedicated Adaptive Server Enterprise database called the Replication Server System Database (RSSD), or in an embedded Replication Server System Database (ERSSD) using SQL Anywhere®.
• Initial Disk Partition for Each Replication Server
  Replication Server stores messages, such as replicated transactions, on disk in stable queues. Disk space for the queues is allocated from disk partitions you create. A disk partition can be a raw disk partition or an operating system file.
• ID Server
  The ID Server is a Replication Server that registers all Replication Servers and databases in the replication system.
• Databases that Require Replication Agents
  A Replication Agent retrieves transactions from a database log and passes them to the replication system through the Replication Server that manages the database.
• Databases that Require Warm Standby
  Replication Server can maintain a warm standby database for an Adaptive Server or Oracle database. If the active database fails, clients can switch to the standby database with little interruption.