Final answer:
Serializability is hard to check in a database system as it requires analyzing dependencies and conflicts between transactions. In an operating system, the scheduler is responsible for the order of execution of processes or threads.
Step-by-step explanation:
Serializability refers to the property of a schedule in a database system where the outcome of concurrent transactions is equivalent to that of a serial execution of the transactions. It ensures that the concurrent execution of transactions does not result in any inconsistencies or loss of data. However, checking the serializability of operations is a complex task.
Serializability is hard to check because it involves analyzing the dependencies between transactions and their conflicts. This can be done through multiple techniques such as conflict serializability graph, precedence graph, or by testing for certain types of anomalies like read-write or write-write conflicts.
In an operating system, the scheduling of operations is handled by a scheduler. The scheduler is responsible for determining the order of execution of processes or threads. It ensures fairness, efficient resource utilization, and proper synchronization. The scheduler uses various algorithms like round robin, shortest job first, or priority-based scheduling to schedule operations.