A PL/SQL procedure executing on an Oracle server can call an external procedure or function that is written in the C programming language and stored in a shared library. In order for the Oracle database to connect to external procedures, the server must be configured with a net service name and the listener must be configured with protocol address and service information. Oracle Net Configuration Assistant automatically configures the necessary information during installation.
For more information, see Chapter "Enabling Advanced Features for Oracle Net Services" in the Oracle Net Services Administrator's Guide.
Oracle Net Services Configuration Overview
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