Neither of these common queries care about total, but they're paying the cost of fetching it each time.
这些常见的查询与总数没有任何关系，但每次却都要返回总数，这就需要付出代价。
Total number of overall queries processed
处理的全部查询数量。
Total is useful for rendering paging controls, and count(*) queries (how many of my comments have been up-voted, and so on); so it’s not that the total field itself was a mistake.
总数对于分页控件的渲染很有用，count(*)查询就是如此（比如说人们对我的评论的投票数等等）；从这个角度来说，total字段本身并没有错。
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