The Heterogeneous Services component in Oracle Database communicates with a Heterogeneous Services agent process which, in turn, communicates with the non-Oracle system.
Figure 2-1 presents the structure of the process architecture for Oracle heterogeneous connectivity.
Figure 2-1 Oracle Heterogeneous Connectivity Process Architecture
The code can be conceptually divided into three parts:
The Heterogeneous Services component in Oracle Database
This module performs most of the processing related to heterogeneous connectivity.
Agent generic code
This is code in the agent that is generic to all Heterogeneous Services products. This code communicates with the database and provides multithreading support.
This module communicates with the non-Oracle system. It is used to map calls from the Heterogeneous Services to the native application programming interface (API) of the non-Oracle system, and it is not specific to Oracle systems.