Last_Errno: 1062，Last_Error: Error 'Duplicate entry '...' for key 'PRIMARY'' on query.的详细分析过程
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线上环境我从来没有碰到过1062的问题，测试环境开发环境不停的出现类似问题，以往为了赶时间都是skip或者直接重新做，这会有时间，就好好去查查问题所在。
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1 从库报错信息：
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: xxxx0402.china.online.ea.com
Master_User: replication
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000154
Read_Master_Log_Pos: 56680675
Relay_Log_File: mysql-relay-bin.000455
Relay_Log_Pos: 33013454
Relay_Master_Log_File: mysql-bin.000152
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: 1062
Last_Error: Error 'Duplicate entry '250.1.1-rding-changelogs/myIDENTITY/250/xxxx.xml' for key 'PRIMARY'' on query. Default database: 'identity'. Query: 'INSERT INTO `DATABASECHANGELOG` (`DATEEXECUTED`, `AUTHOR`, `xxxx`, `DESCRIPTION`, `COMMENTS`, `MD5SUM`, `ID`, `FILENAME`) VALUES (NOW(), 'rding', '1.9.3', 'Custom SQL', '', '4ac9fbf5222bc344362ccdecbc072', '250.1.1', 'changelogs/myIDENTITY/250/xxxx.xml')'
Skip_Counter: 0
Exec_Master_Log_Pos: 33013308
Relay_Log_Space: 33020134
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: 1062
Last_SQL_Error: Error 'Duplicate entry '250.1.1-rding-changelogs/myIDENTITY/250/xxxx.xml' for key 'PRIMARY'' on query. Default database: 'identity'. Query: 'INSERT INTO `DATABASECHANGELOG` (`DATEEXECUTED`, `AUTHOR`, `xxxx`, `DESCRIPTION`, `COMMENTS`, `MD5SUM`, `ID`, `FILENAME`) VALUES (NOW(), 'rding', '1.9.3', 'Custom SQL', '', '4ac9fbf5222bc344362ccdecbc072', '250.1.1', 'changelogs/myIDENTITY/250/xxxx.xml')'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)
2 看表结构
mysql> show create table DATABASECHANGELOG;
+-------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| DATABASECHAN