MYSQL 数据库同步
最近要做数据库同步,如果网上找了例子,成功,记录下来,下回再看. 这个是网上找的一编文章. 以下配置在本机上已经成功: 实现功能:A为主服务器,B为从服务器,初始状态时,A和B中的数据信息相同,当A中的数据发生变化时,B也跟着发生相应的变化,使得A和B的数
最近要做数据库同步,如果网上找了例子,成功,记录下来,下回再看.
这个是网上找的一编文章.
以下配置在本机上已经成功:
实现功能:A为主服务器,B为从服务器,初始状态时,A和B中的数据信息相同,当A中的数据发生变化时,B也跟着发生相应的变化,使得A和B的数据信息同步,达到备份的目的。
环境:
A、B的MySQL数据库版本同为4.1.20
A:
操作系统:Windows 2003 server
IP地址:192.168.100.1
B:
操作系统:Windows 2003 server
的IP地址:192.168.100.2
配置过程:
1、在A的数据库中建立一个备份帐户,命令如下:
GRANT REPLICATION SLAVE,RELOAD,SUPER ON *.*
TO backup@'192.168.100.2'
IDENTIFIED BY ‘1234’;
建立一个帐户backup,并且只能允许从192.168.100.2这个地址上来登陆,密码是1234。
2、因为mysql版本新密码算法不同,所以进入mysql下,输入:set password for 'backup'@'192.168.100.2'=old_password('1234');
3、关停A服务器,将A中的数据拷贝到B服务器中,使得A和B中的数据同步,并且确保在全部设置操作结束前,禁止在A和B服务器中进行写操作,使得两数据库中的数据一定要相同!
4、对A服务器的配置进行修改,打开mysql/my.ini文件,在[mysqld]下面添加如下内容:
server-id=1
log-bin=c:log-bin.log
server-id:为主服务器A的ID值
log-bin:二进制变更日值
5、重启A服务器,,从现在起,它将把客户堆有关数据库的修改记载到二进制变更日志里去。
6、关停B服务器,对B服务器锦熙配置,以便让它知道自己的镜像ID、到哪里去找主服务器以及如何去连接服务器。最简单的情况是主、从服务器分别运行在不同的主机上并都使用着默认的TCP/IP端口,只要在从服务器启动时去读取的mysql/my.ini文件里添加以下几行指令就行了。
[mysqld]
server-id=2
master-host=192.168.100.1
master-user=backup
master-password=1234
//以下内容为可选
replicate-do-db=backup
server-id:从服务器B的ID值。注意不能和主服务器的ID值相同。
master-host:主服务器的IP地址。
master-user:从服务器连接主服务器的帐号。
master-password:从服务器连接主服务器的帐号密码。
replicate-do-db:告诉主服务器只对指定的数据库进行同步镜像。
7、重启从服务器B。至此所有设置全部完成。更新A中的数据,B中也会立刻进行同步更新。如果从服务器没有进行同步更新,你可以通过查看从服务器中的mysql_error.log日志文件进行排错。
8、由于设置了slave的配置信息,mysql在数据库data目录下生成master.info,所以如有要修改相关slave的配置要先删除该文件,否则修改的配置不能生效。
如果要两台同时同步的话,只要server-id不同就行了.如果同步失败,可以用下面的语句来查看.
1.show master statusG; 查看主机情况.
2.show slave statusG; 从机情况.
如果两台的ID和文件不同,可以用下面的语句更正.
CHANGE MASTER TO master_def [, master_def] ...
master_def:
MASTER_HOST = 'host_name'
| MASTER_USER = 'user_name'
| MASTER_PASSWORD = 'password'
| MASTER_PORT = port_num
| MASTER_CONNECT_RETRY = count
| MASTER_LOG_FILE = 'master_log_name'
| MASTER_LOG_POS = master_log_pos
| RELAY_LOG_FILE = 'relay_log_name'
| RELAY_LOG_POS = relay_log_pos
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