Mysql 主从复制常用管理任务介绍

时间：2022-03-13 22:42

Mysql主从日常管理任务主要包括两种:

SQL 线程也不再从中继日志读取事件并执行事件语句。如果想单独控制IO或者SQL线程，需要使用如

下指令分别控制:

#停止IO线程
mysql> stop slave io_thread;
#停止SQL线程
mysql> stop slave sql_thread;

#分别启用IO和SQL线程:
mysql> start slave io_thread;
mysql> start slave sql_thread;

模拟控制线程并查看主从复制状态:

停止IO线程，并查看主从复制状态:

mysql> stop slave io_thread;
Query OK, 0 rows affected (0.09 sec)

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.200.20
                  Master_User: replica
                  Master_Port: 3306
                Connect_Retry: 10
              Master_Log_File: mysql-binlog.000017
          Read_Master_Log_Pos: 120
               Relay_Log_File: mysql-relaylog.000007
                Relay_Log_Pos: 286
        Relay_Master_Log_File: mysql-binlog.000017
             Slave_IO_Running: No
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 120
              Relay_Log_Space: 624
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
                  Master_UUID: e84592e0-0e5b-11e4-a5d3-000c29e88022
             Master_Info_File: /usr/local/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
1 row in set (0.00 sec)

可以看到Slave_IO_Status 状态值为No,而Slave_SQL_Status 状态值仍为 Yes.

Slave_IO_Status 也为空值了。

再停止SQL线程:

mysql> stop slave sql_thread;
Query OK, 0 rows affected (0.10 sec)

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.200.20
                  Master_User: replica
                  Master_Port: 3306
                Connect_Retry: 10
              Master_Log_File: mysql-binlog.000017
          Read_Master_Log_Pos: 120
               Relay_Log_File: mysql-relaylog.000007
                Relay_Log_Pos: 286
        Relay_Master_Log_File: mysql-binlog.000017
             Slave_IO_Running: No
            Slave_SQL_Running: No
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 120
              Relay_Log_Space: 624
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
                  Master_UUID: e84592e0-0e5b-11e4-a5d3-000c29e88022
             Master_Info_File: /usr/local/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State:
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
1 row in set (0.00 sec)

可以看到Slave_IO_Status 、Slave_SQL_Status 状态值全为 No.

再次执行"start slave" 或者分别执行"start slave io_thread"和"start slave sql_thread":

mysql> start  slave ;
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.200.20
                  Master_User: replica
                  Master_Port: 3306
                Connect_Retry: 10
              Master_Log_File: mysql-binlog.000017
          Read_Master_Log_Pos: 120
               Relay_Log_File: mysql-relaylog.000008
                Relay_Log_Pos: 286
        Relay_Master_Log_File: mysql-binlog.000017
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 120
              Relay_Log_Space: 624
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
                  Master_UUID: e84592e0-0e5b-11e4-a5d3-000c29e88022
             Master_Info_File: /usr/local/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
1 row in set (0.00 sec)

查看复制状态，主从复制恢复正常.

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