#include <db_cxx.h> int DbEnv::get_metadata_dir(const char **dirp);
        The DbEnv::get_metadata_dir() method
        returns
        the directory where persistent metadata is stored. This location
        can be set using the 
        DbEnv::set_metadata_dir()
        method.
    
        The DbEnv::get_metadata_dir() directory may
        be called at any time during the life of the application.
    
         The DbEnv::get_metadata_dir() 
            
            
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.