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Library not loaded: libmysqlclient.16.dylib error when trying to run 'rails server' on OS X 10.6 wit
...his way you don't need to use install_name_tool every time you update your mysql
sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib
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高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，SNS，广告推送，邮件等有大量线上并发请求的场景。
如何抗大流量高并发？（不要告诉我把服务器买的再好一点）说起来很简单，就是“分”，如何“分”，简单的说就是把不同的业务分拆到不同的服务器上去跑（垂直拆分...
What guarantees are there on the run-time complexity (Big-O) of LINQ methods?
...).
Distinct, GroupBy Join, and I believe also the set-aggregation methods (Union, Intersect and Except) use hashing, so they should be close to O(N) instead of O(N²).
Contains checks for an ICollection implementation, so it may be O(1) if the underlying collection is also O(1), such as a HashSet<...
MySQL error 2006: mysql server has gone away
...rver at my office to process some files and report the results to a remote MySQL server.
28 Answers
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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...章，读者不仅可以了解 ulimit 所起的作用，并且可以学会如何更好地通过 ulimit 限制资源的使用来改善系统性能。
概述
系统性能一直是一个受关注的话题，如何通过最简单的设置来实现最有效的性能调优，如何在有限资源的...
WhatsApp如何成为销售钻戒的店面？ - 资讯 - 清泛网 - 专注C/C++及内核技术
WhatsApp如何成为销售钻戒的店面？Rare Pink CEO尼古拉·皮瑞安科夫。他的一些顾客将跟他在WhatsApp上的销售人员一道，经历设计和选择婚戒的整个过程。购买钻石结婚戒指不...
Rare Pink CEO尼古拉·皮瑞安科夫。他的一些顾客将跟他在...
Select first row in each GROUP BY group?
...mon problem can surprisingly be found in the one of most official sources, MySQL manual! See Examples of Common Queries :: The Rows Holding the Group-wise Maximum of a Certain Column.
MySQL: determine which database is selected?
After calling mysql_select_db to grab a database, is there any way to later output the name of the database that is currently selected? This seems very basic but I couldn't find anything on php.net or stackoverflow (all results are for "no database selected").
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Insert current date in datetime format mySQL
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If you're looking to store the current time just use MYSQL's functions.
mysql_query("INSERT INTO `table` (`dateposted`) VALUES (now())");
If you need to use PHP to do it, the format it Y-m-d H:i:s so try
$date = date('Y-m-d H:i:s');
mysql_query("INSERT INTO `table` (`datepo...
How can I tell when a MySQL table was last updated?
..."last updated the xx/xx/200x" with this date being the last time a certain mySQL table has been updated.
15 Answers
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