【www.bbyears.com--php安装】
明天就五一了, 结果数据库挂了~
原因还没搞清楚,不过主从同步也随之出问题了~
按照常理跳过问题点的处理方式已经没办法解决了, 所以这里提供我的暴力处理方式
首先登陆主数据库,锁表、重置位置即文件参数(都说了是暴力)
FLUSH TABLES WITH READ LOCK;
reset master;
用各种办法备份你的所有待同步的表,比如到处语句啊, 还有直接把数据库文件复制到从服务器上呀(仅限MyISAM), 总之方法随便你
其次登陆从数据库,重置参数
reset master;
stop slave;
reset slave;
最后将主库的数据与从库数据保持一致, 你可以采取备份主库导入从库,或者直接覆盖(仅限MyISAM)
然后重启从数据库
service mysql restart;
接着直接解锁主数据库
unlock tables;
然后查看状态, 基本上问题就解决了, 但还是不推荐大家在生产环境中这么高
从:
show slave status\G
主:
show master status\G
mysql主从复制跳过错误
mysql主从复制，经常会遇到错误而导致slave端复制中断，这个时候一般就需要人工干预，跳过错误才能继续
跳过错误有两种方式：
1.跳过指定数量的事务：
mysql>slave stop;
mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1 #跳过一个事务
mysql>slave start
2.修改mysql的配置文件，通过slave_skip_errors参数来跳所有错误或指定类型的错误
vi /etc/my.cnf
[mysqld]
#slave-skip-errors=1062,1053,1146 #跳过指定error no类型的错误
#slave-skip-errors=all #跳过所有错误
例：下面模拟一个错误场景
环境（一个已经配置好的主从复制环境）
master数据库IP：192.168.247.128
slave数据库IP：192.168.247.130
mysql版本：5.6.14
binlog-do-db = mydb
在master上执行以下语句：
mysql>use mysql;
mysql>create table t1 (id int);
mysql>use mydb;
mysql>insert into mysql.t1 select 1;
在slave上查看复制状态
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.247.128
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000017
Read_Master_Log_Pos: 2341
Relay_Log_File: DBtest1-relay-bin.000011
Relay_Log_Pos: 494
Relay_Master_Log_File: mysql-bin.000017
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: 1146
Last_Error: Error "Table "mysql.t1" doesn"t exist" on query. Default database: "mydb". Query: "insert into mysql.t1 select 1"
Skip_Counter: 0
Exec_Master_Log_Pos: 1919
Relay_Log_Space: 1254
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: 1146
Last_SQL_Error: Error "Table "mysql.t1" doesn"t exist" on query. Default database: "mydb". Query: "insert into mysql.t1 select 1"
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: f0f7faf6-51a8-11e3-9759-000c29eed3ea
Master_Info_File: /var/lib/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: 131210 21:37:19
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
由结果可以看到，Read_Master_Log_Pos: 2341，Exec_Master_Log_Pos: 1919 时出错了Last_SQL_Error: Error "Table "mysql.t1" doesn"t exist" on query.
因为只对mydb记录了binlog,当在mydb库操作其它数据库的表，但该表在slave上又不存在时就出错了。
我们可在看看binlog里的事务内容，这里一行代表一个事务
mysql> SHOW BINLOG EVENTS in "mysql-bin.000017" from 1919\G
*************************** 1. row ***************************
Log_name: mysql-bin.000017
Pos: 1919
Event_type: Query
Server_id: 1
End_log_pos: 1999
Info: BEGIN
*************************** 2. row ***************************
Log_name: mysql-bin.000017
Pos: 1999
Event_type: Query
Server_id: 1
End_log_pos: 2103
Info: use `mydb`; insert into mysql.t1 select 1
*************************** 3. row ***************************
Log_name: mysql-bin.000017
Pos: 2103
Event_type: Xid
Server_id: 1
End_log_pos: 2134
Info: COMMIT /* xid=106 */
*************************** 4. row ***************************
Log_name: mysql-bin.000017
Pos: 2134
Event_type: Query
Server_id: 1
End_log_pos: 2213
Info: BEGIN
*************************** 5. row ***************************
Log_name: mysql-bin.000017
Pos: 2213
Event_type: Query
Server_id: 1
End_log_pos: 2310
Info: use `mydb`; insert into t1 select 9
*************************** 6. row ***************************
Log_name: mysql-bin.000017
Pos: 2310
Event_type: Xid
Server_id: 1
End_log_pos: 2341
Info: COMMIT /* xid=107 */
6 rows in set (0.00 sec)
由上面的结果可知，我们需要跳过两个事务（Pos: 1999 insert,Pos: 2103 commit)
跳过操作：
mysql>slave stop;
mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 2 跳过一个事务
mysql>slave start
mysql> show slave status\G
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 3
Current database: mydb
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.247.128
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000017
Read_Master_Log_Pos: 3613
Relay_Log_File: DBtest1-relay-bin.000018
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.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: 3613
Relay_Log_Space: 458
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: f0f7faf6-51a8-11e3-9759-000c29eed3ea
Master_Info_File: /var/lib/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 (0.01 sec)
复制状态正常。