Limits the number of file descriptors the library will open concurrently when flushing dirty pages from the cache.
                 The syntax of this parameter in the DB_CONFIG file is
                 a single line with the string set_max_openfd, 
                 one or more whitespace characters, and the
				number of open file descriptors. 
            
For more information, see DbEnv::get_mp_max_openfd().