mysql UPDATE 比 INSERT INTO 快吗?

Is mysql UPDATE faster than INSERT INTO?(mysql UPDATE 比 INSERT INTO 快吗?)

问题描述

这更像是一个理论问题.

This is more of a theory question.

如果我运行 50,000 个插入新行的查询和 50,000 个更新这些行的查询，哪一个会花费更少的时间?

If I'm running 50,000 queries that insert new rows, and 50,000 queries that updates those rows, which one will take less time?

推荐答案

插入会更快，因为更新需要先搜索要更新的记录，然后再执行更新.

Insert would be faster because with update you need to first search for the record that you are going to update and then perform the update.

尽管这似乎不是一个有效的比较，因为您永远无法选择是插入还是更新，因为两者满足了两个完全不同的需求.

Though this hardly seems like a valid comparison as you never have a choice whether to insert or update as the two fill two completely different needs.

我也应该补充一点，这是假设没有插入触发器或其他可能导致潜在瓶颈的情况.

I should add too that this is with the assumption that there are no insert triggers or other situations that could cause potential bottlenecks.

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