10. The method of claim 8 , wherein performing the predefined action comprises: interrupting the iterative execution of the query against the samples of the database; generating a modified condition on the basis of the authorized modifications to the predefined condition; resuming the iterative execution of the query against one or more samples of the database; determining whether the query result obtained for each subsequent iterative execution of the query satisfies the modified condition; and if the modified condition is not satisfied, performing the predefined action.
11. The method of claim 10 , further comprising: determining whether all previous query results obtained for the iterative executions performed prior to receiving the modified condition satisfy the modified condition; and if the modified condition is not satisfied by one or more of the previous query results, performing the predefined action.