Solution to non-synchronization of mysql Master/Slave Databases

The following error occurs: "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', or the Master/Slave database is not synchronized due to data clearing. The solution is as follows:

First, go to slave and execute: "slave stop;" to stop slave database synchronization;

Run "flush logs;" in the master to clear logs;

Then execute "show master status;" in the master to check the status of the master database, mainly the log file and position;

Return TO the slave and run: "change master to MASTER_LOG_FILE = 'Log-bin.000004 ', MASTER_LOG_POS = 106;". The file and location correspond TO those in the master;

Finally, Run "slave start;" in slave to start synchronization.