mysql主备异常后的数据同步方式
作者：stone1116
文章介绍了MySQL数据库的锁定和解锁操作,包括如何处理连接异常、查看主备数据库状态、停止从库、导入备份数据、重新设置同步节点以及处理正常从库异常的步骤
mysql主备异常后的数据同步
1、锁定正常库
flush table with read lock;
锁定后查询正常，数据不能修改插入操作。
2、导出库中的数据
mysqldump -uroot -p123456 --opt -R test > /home/bakdb.sql
注：如果出现异常信息
mysqldump: Got error: 2002: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) when trying to connect
使用下面命令，socket在my.cnf文件中
mysqldump --socket=/var/lib/mysql/mysql.sock -uroot -p123456 --opt -R test > /home/bakdb.sql
3、查看主备数据库的信息
show master status;
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000006 | 726 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.01 sec)
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000003 | 2060 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
4、在从库上停止slave
stop slave;
5、导入备份的数据文件
mysql> source /home/bak.sql
6、重新设置同步节点
下面操作解锁库，并关闭slave后进行操作
stop slave; unlock tables; CHANGE MASTER TO master_host = '192.168.123.82', master_port = 3306, master_user = 'root', master_password = '123456', master_log_file = 'mysql-bin.000003', master_log_pos = 2060; CHANGE MASTER TO master_host = '192.168.123.78', master_port = 3306, master_user = 'root', master_password = '123456', master_log_file = 'mysql-bin.000006', master_log_pos = 726;
7、正常从库异常不需要上面设置
重新启动后会同步数据。
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。