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We had an ugly problem, by mistake, a balancer redirect some requests to a test instance with pretty similar data than production, now I know that there are data recorded in the test Postgres that belongs to production Is there a way to list all the tables with data changes in the last 24 hours in Postgres? Postgres version is 9.3 and I have around 250 tables. First consider my comment. Postgres up to and including 9.4 does not by itself record timestamps when rows were inserted or updated. There are some system columns in the row headers that can help in the forensic work. The physical order

Bizarre question: is it possible to get the last modified date of a file in the assets folder, or would that be pointless and impossible? I ask because I'm copying a read-only database out of there into the data folder on application start up, but would rather only perform the copy if the existing file is older than the one stored in the assets folder (or if the file doesn't exist). If that's not possible, anyone know of a better convention? I can post that in a separate question if needed. TIA! How big/complex is the database? You might find it's easier and more flexible to use an instance of

引子 互联网有一项著名的8秒原则。用户在访问Web网页时，如果时间超过8秒就会感到不耐烦，如果加载需要太长时间，他们就会放弃访问 。大部分用户希望网页能在2秒之内就完成加载。事实上，加载时间每多1秒，你就会流失7%的用户。8秒并不是准确的8秒钟，只是向网站开发者表明了加载时间的重要性。那我们如何优化页面性能，提高页面加载速度呢？这是本文主要要探讨的问题，然而性能优化是个综合性问题，没有标准答案，想要面面俱到罗列出来，并非易事。本文只关注一些核心要点，以下是我总结性能优化常见的办法： 一、资源压缩与合并 主要包括这些方面： html压缩、css 压缩、js的压缩和混乱和文件合并 。 资源压缩可以从文件中去掉多余的字符，比如回车、空格。你在编辑器中写代码的时候，会使用缩进和注释，这些方法无疑会让你的代码简洁而且易读，但它们也会在文档中添加多余的字节。 1.html压缩 html代码压缩就是压缩这些在文本文件中有意义，但是在HTML中不显示的字符，包括空格，制表符，换行符等，还有一些其他意义的字符，如HTML注释也可以被压缩。 如何进行html压缩： 使用在线网站进行压缩(开发过程中一般不用) nodejs 提供了html-minifier工具 后端模板引擎渲染压缩 2.css代码压缩： css代码压缩简单来说就是无效代码删除和css语义合并 如何进行css压缩： 使用在线网站进行压缩