What is an example of an extproc.ora file? What do the contents of extproc file look like? I'm aware that my extproc.ora file is missing, and I'd like to create one in it's absence.

The instructions here tell me to:


  Configure the Oracle extproc.ora to point to the location of the
  ST_Geometry library file.
  
  Make a backup copy of the extproc.ora file on the Oracle server. Open
  the extproc.ora file and alter it to point to the location of the
  st_shapelib.dll (Windows) or libst_shapelib.so (Linux or UNIX)
  library. 
  
  The following line is added
  to extrproc.ora to point to the ST_Geometry library in that directory:
  
  SET EXTPROC_DLLS=ONLY:C:\mylibraries\st_shapelib.dll 
  
  Save and close the extproc.ora file.


I've tried creating an extproc.ora file from scratch, but I don't really know what I'm doing: SET EXTPROC_DLLS=ONLY:C:\mylibraries\st_shapelib.dll.

Not surprisingly, the file fails.

Rather than just dream up what I think the file should contain, I'd like to copy an existing example. I've searched the web, but have not come up with any complete examples of extproc.ora. Not even in the Oracle documentation: https://docs.oracle.com/database/121/NETAG/advcfg.htm#NETAG0133

What is an example of an extproc.ora file?
Why do you expect that "there must be more to it"? extproc.ora simply sets environment variables for the extproc daemon, which is used to execute code for external stored procedures, and for procedures themselves. There is some documentation in the application development guide. 

The one environment variable that seems to be recognized by extproc itself is EXTPROC_DLLS that you mention, which determines the locations where the daemon looks for shared libraries. If set to ONLY:&lt;path&gt; it won't look in $ORACLE_HOME/bin or $ORACLE_HOME/lib. 

Any other variables set in extproc.ora are simply passed on to the environment where the external code runs, so they would be specific to each library.