If you include the MySQL server with an application that is not licensed under the GPL or GPL-compatible license, you need a commercial license for the MySQL server.
If you develop and distribute a commercial application and as part of utilizing your application, the end-user must download a copy of MySQL; for each derivative work, you (or, in some cases, your end-user) need a commercial license for the MySQL server and/or MySQL client libraries.
要是这么算的话,mysql用来做商业应用可不是好选择——除非愿意购买它的商业许可。
另外,还有一件事就是mysql似乎不打算再释出二进制安装版本(传闻挺多,官方网站上也言辞闪烁,但有一点可以肯定,更新速度会大大慢于商业版本),虽然自己可以编译安装,但总觉得怪怪的,让人觉得mysql靠扛着开源大旗发家后,开始打背叛革命的主意,一心搂钱了。