Building a DLL

After writing your external procedures in a third-generation programming language, use the appropriate compiler and linker to build a DLL, making sure to export the external procedures as noted previously.

See your compiler and linker documentation for instructions on building a DLL and exporting its functions.

You can build the external procedure FIND_MAX, created in "Writing an External Procedure", into a DLL called extern.dll by going to ORACLE_HOME\rdbms\extproc and typing make. After building the DLL, you can move it to any directory on your system.

The default behavior of EXTPROC is to load DLLs only from ORACLE_HOME\bin or ORACLE_HOME\lib. To load DLLs from other directories, you must set environment variable EXTPROC_DLLS to a colon (:) separated list (semicolon-separated on Windows systems) of the DLL names qualified with their complete paths. The preferred way to set this environment variable is through the ENVS parameter in listener.ora.