#include <db.h> int DB->get_h_nelem(DB *db, u_int32_t *h_nelemp);
         The DB->get_h_nelem() method returns the estimate of the final size
         of the hash table as set by the 
         DB->set_h_nelem()
         method.
    
         The DB->get_h_nelem() method may be called at any time during the
         life of the application.
    
         The DB->get_h_nelem() 
            
                  method returns a non-zero error value on failure and 0 on success.