mysql主從同步問題整理

今早mysql同步失敗,主數據庫有530W而從數據庫只有去350W,幸好是作備份要否則這個就是個事故了.
問題以下:
Last_Error: Relay log read failure: Could not parse relay log event entry. The possible reasons are: the master's binary log is corrupted (you can check this by running 'mysqlbinlog' on the binary log), the slave's relay log is corrupted (you can check this by running 'mysqlbinlog' on the relay log), a network problem, or a bug in the master's or slave's MySQL code. If you want to check the master's binary log or slave's relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' on this slave.

解決方法以下:

• 我嘗試從新配置了下連接,

mysql> CHANGE MASTER TO

-> MASTER_HOST='master_host_name',

-> MASTER_USER='replication_user_name',

-> MASTER_PASSWORD='replication_password',

-> MASTER_LOG_FILE='recorded_log_file_name',

而後出現了,新的錯誤.

Slave_IO_Running: No
      Slave_SQL_Running: Yes
          Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Client requested master to start replication from position > file size'**

• 後來我嘗試了從新配置了position下位置

mysql> stop slave; 
mysql> change master to master_log_file='mysql-bin.000011',master_log_pos=203; 
mysql> start slave; 
#  查看狀態
show slave status\G

Slave_IO_State: Waiting for master to send event
                  Master_Host: 121.196.207.230
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000037
          Read_Master_Log_Pos: 12367642
               Relay_Log_File: DESKTOP-9EVDGPS-relay-bin.000002
                Relay_Log_Pos: 127713
        Relay_Master_Log_File: mysql-bin.000037
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

成功了,可是問題是,目前不清楚這個方案會不致使數據同步出錯,我須要之後檢驗一下.