bitsCN.com
前提条件,两台服务器都安装了mysql相同的版本,数据库名也一样,最好数据都是尽量的差不多。
mysql服务器端 192.168.0.1:
新建一个备用账号,只用来复制数据的
用户名:backup
密码:wwwjb51net
GRANT REPLICATION SLAVE,RELOAD,SUPER ON *.* TO backup@'192.168.0.2' IDENTIFIED BY 'wwwjb51net';
新建用户后需要客户端来检测在客户端是否能连接服务器端。
在[mysqld]下面添加
server-id=10
log-bin=mysql-bin
mysql客户端 192.168.0.2:
检测方法在192.168.0.1
mysql -h 192.168.0.1 -u root -p 如何无法连接请参考这篇文章
server-id=11
master-host=192.168.0.1
master-user=backup
master-password=wwwjb51net
replicate-do-db=jb51
//jb51为要备份的数据库名
测试方法:就是后台中添加数据,然后在客户端所在的网站后台看数据是否都有。
不过经过测试一般情况下不会一次成功都会有些问题,下面的文章你一定要看。基本上就可以了
接着就是查看同步情况
mysql> show slave status/G
Slave_IO_Running: Yes
Slave_SQL_Running: No
Last_Errno: 1062
....
Seconds_Behind_Master:NULL
原因:
1.程序可能在slave上进行了写操作
2.也可能是slave机器重起后,事务回滚造成的.
解决办法I:
1.首先停掉Slave服务:slave stop
2.到主服务器上查看主机状态:
记录File和Position对应的值。
mysql> show master status;
+------------------+-----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+-----------+--------------+------------------+
| mysql-bin.000020 | 135617781 | | |
+------------------+-----------+--------------+------------------+
1 row in set (0.00 sec)
3.到slave服务器上执行手动同步:
mysql> change master to
> master_host='master_ip',
> master_user='user',
> master_password='pwd',
> master_port=3307,
> master_log_file='mysql-bin.000020',
> master_log_pos=135617781;
1 row in set (0.00 sec)
mysql> slave start;
1 row in set (0.00 sec)
再次查看slave状态发现:
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
...
Seconds_Behind_Master: 0
解决办法II:
mysql> slave stop;
mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;
mysql> slave start;
自己的使用体会:方法一是强制性从某一个点开始同步,会有部分没有同步的数据丢失,后续主服务器上删除记录同步也会有一些错误信息,不会影响使用.方法二不一定会有效果.bitsCN.com

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MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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