本来配置可以使用的mysql主从库同步的数据库，突然出现无法同步的情况。那么大家可以参考下面的方法解决下。
遇到这样的错误如：“Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'”等或由于清数据导致主从库不同步了，解决办法如下：先进入slave中执行:"slave stop;"来停止从库同步；
再去master中执行:"flush logs;"来清空日志；
然后在master中执行:"show master status;"查看下主库的状态，主要是日志的文件和position；
然后回到slave中，执行:"CHANGE MASTER TO MASTER_LOG_FILE='log-bin.000004',MASTER_LOG_POS=106;"，文件和位置对应master中的;
最后在slave中执行:"slave start;"来启动同步。
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