MySQL 主备数据库切换报错1396处理方法，操作步骤如下：
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 196.55.3.180
Master_User: repl
Master_Port: 3311
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 1674
Relay_Log_File: relay-log.000002
Relay_Log_Pos: 367
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
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: 1396
Last_Error: Error 'Operation CREATE USER failed for 'repl'@'%'' on query. Default database: ''. Query: 'CREATE USER 'repl'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*2813999EE1B5ABB4D8C2D12234F0649DF6A9BC19''
Skip_Counter: 0
Exec_Master_Log_Pos: 154
Relay_Log_Space: 2217
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: 1396
Last_SQL_Error: Error 'Operation CREATE USER failed for 'repl'@'%'' on query. Default database: ''. Query: 'CREATE USER 'repl'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*2813999EE1B5ABB4D8C2D12234F0649DF6A9BC19''
Replicate_Ignore_Server_Ids:
Master_Server_Id: 10003
Master_UUID: 84aa2159-14f8-11ea-bc00-00505687741b
Master_Info_File: mysql.slave_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: 191204 19:51:57
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 1b4e1296-14f7-11ea-8332-005056873bbd:1-2,
84aa2159-14f8-11ea-bc00-00505687741b:1
Executed_Gtid_Set: 183c6bb2-5f65-11e9-b3cf-0050568745fc:1-8807
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> show master status;
+------------------+----------+--------------+------------------+---------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+---------------------------------------------+
| mysql-bin.000006 | 5719971 | | | 183c6bb2-5f65-11e9-b3cf-0050568745fc:1-8807 |
+------------------+----------+--------------+------------------+---------------------------------------------+
1 row in set (0.00 sec)
mysql> select * from performance_schema.replication_applier_status_by_worker where LAST_ERROR_NUMBER=1396;
+--------------+-----------+-----------+---------------+----------------------------------------+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+
| CHANNEL_NAME | WORKER_ID | THREAD_ID | SERVICE_STATE | LAST_SEEN_TRANSACTION | LAST_ERROR_NUMBER | LAST_ERROR_MESSAGE | LAST_ERROR_TIMESTAMP |
+--------------+-----------+-----------+---------------+----------------------------------------+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+
| | 0 | NULL | OFF | 1b4e1296-14f7-11ea-8332-005056873bbd:1 | 1396 | Error 'Operation CREATE USER failed for 'repl'@'%'' on query. Default database: ''. Query: 'CREATE USER 'repl'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*2813999EE1B5ABB4D8C2D12234F0649DF6A9BC19'' | 2019-12-04 20:02:13 |
+--------------+-----------+-----------+---------------+----------------------------------------+-------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+
1 row in set (0.00 sec)
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
mysql> set @@session.gtid_next='1b4e1296-14f7-11ea-8332-005056873bbd:1';
Query OK, 0 rows affected (0.00 sec)
mysql> begin;
Query OK, 0 rows affected (0.00 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> set @@session.gtid_next=automatic;
Query OK, 0 rows affected (0.00 sec)
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 196.55.3.180
Master_User: repl
Master_Port: 3311
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 1674
Relay_Log_File: relay-log.000005
Relay_Log_Pos: 494
Relay_Master_Log_File: mysql-bin.000002
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: 1674
Relay_Log_Space: 1154
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: 10003
Master_UUID: 84aa2159-14f8-11ea-bc00-00505687741b
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 1b4e1296-14f7-11ea-8332-005056873bbd:1-2,
84aa2159-14f8-11ea-bc00-00505687741b:1
Executed_Gtid_Set: 183c6bb2-5f65-11e9-b3cf-0050568745fc:1-8807,
1b4e1296-14f7-11ea-8332-005056873bbd:1-2,
84aa2159-14f8-11ea-bc00-00505687741b:1
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql>