Final answer:
Under special circumstances such as read-only transactions or the use of synchronization mechanisms, schedules that are not conflict serializable may still operate correctly.
Step-by-step explanation:
Under special circumstances, schedules that are otherwise not conflict serializable may work correctly. This can occur in situations where there are additional constraints or mechanisms that ensure data consistency despite the non-serializability of the schedule.
An example of such a circumstance is when transactions only read data and do not perform any writes; in these cases, the order of execution may not be significant and non-conflict serializable schedules may produce correct results.
Additionally, if the data being accessed is guaranteed not to change during the transactions' execution (for example, by using semantic locks or other synchronization mechanisms), non-conflict serializable schedules might still maintain the integrity of the data.