一、环境
OS：CentOS release 5.8(64位)
DB：MySQL5.5.17
二、操作
直接通过命令 rm -f 删除了慢查询日志
三、出现问题
慢查询日志没有自动生成，（如果有备份，再次拷贝回来也是不好使的）
四、解决方法
管理员身份登录MySQL 执行命令 flush logs;
如果执行后，提示执行成功，而实际上慢查询日志还是没有生成，则执行以下命令（先关闭慢查询，再开启）
SET GLOBAL log_slow_queries = off;（关闭慢查询）
SET GLOBAL log_slow_queries = ON;（重开启慢查询）
问题解决，OK!
五、建议
如果遇到慢查询日志文件过大，需要回收空间加以利用，或者其他原因需要删除慢查询日志文件，建议不要直接 rm 掉慢查询日志文件，可以置空日志文件，
如：>mysql-slow.log
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