我有这个脚本来测量查询执行所需的时间：
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结果，我得到一个递增的结果列表：
<script>好的，所以它并没有完全增加，但它会永远上升...... 我希望得到几乎相同数字的列表（查询应该几乎同时进行）。
任何人都知道为什么时间一直在上升？
答案 0 :(得分：0)
这是因为你没有测量只是查询时间。
此代码的基本流程为：
for循环运行完成，将每次迭代的开始时间设置为每次迭代发生的时间。findOneAsync调用后立即开始。findOneAsync回调将被放在事件队列中，并且它们的连接将返回到池中，从而允许后续迭代的查询开始。因此，所有迭代次数都包括完成剩余for循环后的时间，等待池中连接可用的时间以及findOneAsync回调的时间在事件队列中等待。
如果您想准确了解查询的持续时间，请使用MongoDB的profiling支持。