mysql 从库如何跳过一个事务

其实mysql的从库 就相当于oracle的逻辑备库的概念，理解了这个解决mysql从库的问题就很轻松了

我们来模拟情况，我们在主库删除一个数据库，而从库是没有这个数据库的，此时从库就报错了

mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.37.129.3
Master_User: kiwi
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 377
Relay_Log_File: mysqld-relay-bin.000006
Relay_Log_Pos: 366
Relay_Master_Log_File: mysql-bin.000006
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: 1008
Last_Error: Error 'Can't drop database 'yao'; database doesn't exist' on query. Default database: 'yao'. Query: 'drop database yao'
Skip_Counter: 0
Exec_Master_Log_Pos: 203
Relay_Log_Space: 877
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: 1008
Last_SQL_Error: Error 'Can't drop database 'yao'; database doesn't exist' on query. Default database: 'yao'. Query: 'drop database yao'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: eecf3d7b-b4d0-11e4-a343-001c42e98b78
Master_Info_File: /opt/mysql/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: 150303 02:43:48
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)

ERROR:
No query specified

我们根据这两个列的情况，从主库查询事务

Master_Log_File: mysql-bin.000006

Exec_Master_Log_Pos: 203

mysql> SHOW BINLOG EVENTS in 'mysql-bin.000006' from 203\G
*************************** 1. row ***************************
Log_name: mysql-bin.000006
Pos: 203
Event_type: Query
Server_id: 2
End_log_pos: 286
Info: drop database yao
*************************** 2. row ***************************
Log_name: mysql-bin.000006
Pos: 286
Event_type: Query
Server_id: 1
End_log_pos: 377
Info: create database xin
2 rows in set (0.00 sec)

mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;
Query OK, 0 rows affected (0.00 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.37.129.3
Master_User: kiwi
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 377
Relay_Log_File: mysqld-relay-bin.000006
Relay_Log_Pos: 540
Relay_Master_Log_File: mysql-bin.000006
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: 377
Relay_Log_Space: 877
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: eecf3d7b-b4d0-11e4-a343-001c42e98b78
Master_Info_File: /opt/mysql/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)

ERROR:
No query specified

数据库恢复了