## Deactivation between constraints |

The Rules Engine deactivates between constraints at compile time. This happens: •When flat files are created. •If you run from repository, the first time a particular set of constraints is loaded on the client as a result of row events. In this process, the optimal order in which to examine pre-store constraints is determined. Example This illustration shows a situation in which the Rules Engine knows that if a constraint A results in a correction, constraint B no longer needs to be considered for the same record. Constraint B is deactivated by constraint A: On the basis of such dependencies, the constraints that are most likely to deactivate the greatest number of other constraints are evaluated first. In general, constraint X deactivates constraint Y in the following situations: •The postcondition of X and the precondition of Y are mutually exclusive. If X succeeds for the current row, Y can no longer be applicable to this row. •The postcondition of X and the postcondition of Y are equivalent. If X succeeds from the current row, then there is no point in evaluating Y since the result would be the same. •The preconditions of X and Y are mutually exclusive. If X applies to the current row, then Y cannot apply to it and vice versa.
See also Deactivation between incoming data, preconditions and postconditions |