#include <db_cxx.h> int DbEnv::get_tx_max(u_int32_t *tx_maxp);
            The DbEnv::get_tx_max() method returns the maximum number of active
            transactions currently configured for the environment. You can manage this value using
            the DbEnv::set_tx_max() method.
    
         The DbEnv::get_tx_max() method may be called at any time during the
         life of the application.
    
         The DbEnv::get_tx_max() 
            
            
                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.