#include <db.h> int DB_ENV->get_tx_max(DB_ENV *dbenv, u_int32_t *tx_maxp);
            The DB_ENV->get_tx_max() method returns the maximum number of active
            transactions currently configured for the environment. You can manage this value using
            the DB_ENV->set_tx_max() method.
    
         The DB_ENV->get_tx_max() method may be called at any time during the
         life of the application.
    
         The DB_ENV->get_tx_max() 
            
                  method returns a non-zero error value on failure and 0 on success.