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。
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。
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.
由于那些被触发的动作通常是一条或多条insert、UPDATE或delete语句，因此，在数据量很大的insert中，触发器的开销会很大。
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