解决MySQL数据库同步1236错误

1、报错如下：

Got fatal error  from master when reading data from binary log: 'The slave is connecting using CHANGE MASTER TO MASTER_AUTO_POSITION = 1, but the master has purged binary logs containing GTIDs that the slave requires.'

2、问题解决：

　　查看master gtid_purged

 show global variables like '%gtid%';
 找到gtid_purged的值

3、从库执行：

mysql> stop slave;
Query OK,  rows affected (0.18 sec)
 
mysql> reset slave;
Query OK,  rows affected (1.29 sec)
 
mysql> reset master;
Query OK,  rows affected (1.18 sec)
 
mysql>  set @@global.gtid_purged='你的GITD值';
Query OK,  rows affected (2.12 sec)
 
mysql> change master to master_host='MASTER_IP',master_port=PORT,master_user='USERNAME',master_password='PASSWORD',master_auto_position=;
Query OK,  rows affected,  warnings (5.55 sec)
 
mysql> start slave;
Query OK,  rows affected (0.40 sec)
 
mysql> show slave status \G
*************************** . row ***************************
               Slave_IO_State: Queueing master event to the relay log
                  Master_Host: xxx
                  Master_User: xxx
                  Master_Port: xxx
                Connect_Retry:
              Master_Log_File: mysql-bin.
          Read_Master_Log_Pos:
               Relay_Log_File: mysql-relay.
                Relay_Log_Pos:
        Relay_Master_Log_File: mysql-bin.
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: xxx
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:xxx
                   Last_Errno:
                   Last_Error:
                 Skip_Counter:
          Exec_Master_Log_Pos:
              Relay_Log_Space:
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos:
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno:
                Last_IO_Error:
               Last_SQL_Errno:
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: xxx
                  Master_UUID: xxx
             Master_Info_File: /data02/mysql/master.info
                    SQL_Delay:
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: System lock
           Master_Retry_Count:
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set: xxx
            Executed_Gtid_Set: GTID值
                Auto_Position:
 row in set (0.45 sec)