Because exceptions are rarely quick to process, the additional overhead of loading extra classes may push operation latency above a critical threshold.
由于异常通常难以快速处理，所以加载额外的类的附加开销可能使操作延迟超出重要阈值。
2
A function call would take way too much overhead for a simple operation.
对于这种简单的操作来说，函数调用的开销太大。
3
Since those triggered actions are typically one or more insert, UPDATE, or DELETE statements, the overhead of triggers can be substantial in a mass insert operation.