Which subsystem processes connections between the Cisco Unified CCX server and the enterprisedatabases?

The Database subsystem enables the Unified CCX applications to obtain information from data sources, which are databases configured to communicate with the Unified CCX system. You can connect the Unified CCX system with enterprise databases such as Microsoft SQL Server, Sybase, Oracle, or IBM DB2. The Database subsystem is available if your system has a license installed for either the Unified IP IVR or Unified CCX Premium product packages. If you are not using Unified CCX applications that require access to databases, you do not need to provision the Database subsystem. References: Cisco Unified Contact Center Express Administration Guide, Release 11.5 (1) - Provision of Additional Subsystems