我的MySQL版本是5.0.75，因为一直看的文档是中文那一版的，很老了的，提到了MySQL-Max的这个扩展模式，但我怎么感觉自己用的时候虽然不是这个模式，是标准模式MySQL-server就有了扩展模式的东东了呢，然后又发现没有MySQL-Max了，历经一些周折找到了问题所在，供大家参考：
· MySQL 5.0.27 is the last version in MySQL 5.0 for which MySQL-Max binary distributions are provided, except for RPM distributions. For RPMs, MySQL 5.0.37 is the last release. After these versions, the features previously included in the mysqld-max server are included in mysqld.
If you previously installed a MySQL-Max distribution that includes a server named mysqld-max, and then upgrade later to a non-Max version of MySQL, mysqld_safe still attempts to run the old mysqld-max server. If you perform such an upgrade, you should remove the old mysqld-max server manually to ensure that mysqld_safe runs the new mysqld server.
以上的内容摘自MySQL的官网的5.1的在线帮助文档，大概的意思就是说5.0.27是二进制分发版中有MySQL-Max的最后一版，5.0.37是RPM分发版中有MySQL-Max的最后一版，以后的版本中MySQL-Max已经包含到mysqld中了。