问HN：哪些工程小知识让你获得了最多的认可？
有没有某个特定的工程知识促使你做出显著贡献？<p>举个软件工程的例子：知道Postgres的外键（FK）不会隐式创建索引。我参与的三个不同项目都没有意识到这一点，我们通过极小的努力就成功提升了性能。<p>期待听到你的成功经验（并把它们变成我的 ^^）。
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Is there a specific piece of engineering knowledge that powered you to substantially contribute?<p>A software engineering example: knowing that Postgres FK doesn't implicitly create an index. Three different projects I joined weren't aware of this and we managed to improve the performance with a negligible amount of effort.<p>Keen to hear your wins (and make them mine ^^