When Unity is configured with two Teradata systems, each of the two regions have the following processes:
- Endpoint
- Sequencer
- Watchdog
- Recovery log
- Two dispatchers
Each Unity system also has a Unity repository with configuration settings and a data dictionary.
Each Teradata system has a transaction table that is created as part of system activation.
Each process is assigned a region. To provide high availability, each region may contain failover copies of processes from other regions.