The first node in the Unified Intelligence Center cluster is the Controller. For database replication, this node is referred to as the "publisher". This means that it publishes or replicates, its databases to Member nodes.
The Member nodes are referred to as subscribers of the database replication. Members receive data from the publisher.
Each node on which reporting functionality is processed (the Controller node and each member node) has a CUIC database which is constantly accumulating and removing records; for example, when a dashboard is added or a user record is removed.
When all nodes are up, changes to the CUIC databases replicate synchronously among the Controller/publisher and all Member/subscribers by means of an "update anywhere" model. See Database Replication for more information.
Database maintenance is performed by the Disaster Recovery System.