MySQL主从同步状态
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因为mysql的slave报错，导致slave落后master很远。找资料查看同步状态。
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.0.103
Master_User: root
Master_Port: 3306
Connect_Retry: 10
Master_Log_File: masterlog.000298
Read_Master_Log_Pos: 780437928
Relay_Log_File: db-relay-bin.000246
Relay_Log_Pos: 589923335
Relay_Master_Log_File: masterlog.000298
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: byread
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: 780437928
Relay_Log_Space: 793806494
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:
1 row in set (0.00 sec)
如果下面一个为NO，表明同步停止。
If either of these is NO, like this, then replication is stopped:
Slave_IO_Running: No
Slave_SQL_Running: No
以下两项会告诉你什么出错。
The Last_Errno and Last_Error might give you a clue as to what went wrong.
[url]
http://homepage.mac.com/kelleherk/iblog/C711669388/E20070717105144/index.html
[/url]
同步主库文件和位置
Master_Log_File: masterlog.000298
Read_Master_Log_Pos: 780437928
从库执行到的文件位置
Relay_Master_Log_File: masterlog.000298
Exec_Master_Log_Pos: 780437928
当主库和从库对应一致时表明同步正常。
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