MYSQL----数据同步,双向热备(转) 原文地址:http://www.iteye.com/topic/153875 ? 1、简要介绍:mysql从3.23.15版本以后提供数据库复制功能。利用该功能可以实现两个数据库同步,主从模式(A-B),互相备份模式(A=B)的功能。 mysql数据库同步复制功能的设置都
MYSQL----数据同步,双向热备(转)原文地址:http://www.iteye.com/topic/153875
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1、简要介绍:mysql从3.23.15版本以后提供数据库复制功能。利用该功能可以实现两个数据库同步,主从模式(A->B),互相备份模式(AB)的功能。
mysql数据库同步复制功能的设置都在mysql的配置文件中体现。在linux环境下的配置文件一般在/etc/mysql/my.cnf或者在mysql用户的home目录下的my.cnf,笔者的my.cnf则在/etc/my.cnf;windows环境下则可到mysql安装路径下找到my.ini。
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2、下面我们来看看如何配置数据同步(A->B):
(笔者mysql版本 5.0.26)
假设数据库A为主机(将向B提供同步服务,即B中的数据来自A):
A机器:
IP = 192.168.1.101
B机器:
IP = 192.168.1.102
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(1).在A机器中有数据库如下:
//数据库A
CREATE DATABASE backup_db; USE backup_db; CREATE TABLE `backup_table` ( ? `id` int(11) NOT NULL auto_increment, ? `name` varchar(20) character set utf8 NOT NULL, ? `sex` varchar(2) character set utf8 NOT NULL, ? PRIMARY KEY? (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; |
#A机器的my.cnf(或my.ini)中应该配置:
server-id=1 log-bin=c:\mysqlback #同步事件的日志记录文件 binlog-do-db=backup_db #提供数据同步服务的数据库 |
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(2).在B机器中有数据库如下:
//数据库B
CREATE DATABASE backup_db; USE backup_db; CREATE TABLE `backup_table` ( ? `id` int(11) NOT NULL auto_increment, ? `name` varchar(20) character set utf8 NOT NULL, ? `sex` varchar(2) character set utf8 NOT NULL, ? PRIMARY KEY? (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; |
注:数据库A和B的数据库结构一定要相同,否则无法构成同步。
#B机器的my.cnf(或my.ini)中应该配置:
server-id=2 master-host=192.168.1.101 #主机A的地址 master-user=ym #主机A提供给B的用户,该用户中需要包括数据库backup_db的权限 master-password=ym #访问密码 master-port=3306 #端口,主机的MYSQL端口 master-connect-retry=60 #重试间隔60秒 replicate-do-db=backup_db #同步的数据库 |
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(3).完成了以上配置之后,将A的mysql数据的权限给B。
A机器:
mysql>GRANT FILE ON *.* TO ym@'192.168.1.102' IDENTIFIEDBY ‘ym’; |
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(4).重启AB数据库,后:
B机器:
mysql>slave start; |
查看同步配置情况
A机器:
mysql>show master status; |
B机器:
mysql>show slave status; |
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(5).在A中的backup_db.backup_table表中插入一些数据,查看B中的backup_db.backup_table表是否同步了数据改动。如果没有看到同步数据结果,即同步不成功,请查看错误(如下)。
当有错误产生时*.err日志文件(可到mysql安装目录下找),同步的线程退出。当纠正错误后重复步骤(4)。
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3、实现双向热备(AB):
将以上的(1)-(5)步骤按A-B双向配置即可。

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