mysql自动备份一系列问题_MySQL
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mysql自动备份一系列问题
测试环境终于搭建好了。。服务器选择了MySQL-server-5.5.28,KEY验证信息也通过了,看来还是系统没装对。
启动数据库:/etc/init.d/mysql start;开始测试:首先连接mysql : >mysql –u root –p初始密码为空,直接回车。之后创建一个数据库,create database weixin;选择该数据库:USE weixin;创建表:create table info(Id INT NOT NULL AUTO_INCREMENT,NAME INT,INFO INT,Ts TIMESTAMP,PRIMARY KEY(Id));
需要注意的是AUTO_INCREMENT,只能有一个。主键也只能有一个。
三、出错解决
1.
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'mysql'
因为mysql数据库的user表里,存在用户名为空的账户即匿名账户,导致登录的时候是虽然用的是root,但实际是匿名登录的,通过错误提示里的''@'localhost'可以看出来
方法一:
1.关闭mysql # service mysqld stop2.屏蔽权限 # mysqld_safe --skip-grant-table 屏幕出现: Starting demo from .....3.新开起一个终端输入 # mysql -u root mysql mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root'; mysql> FLUSH PRIVILEGES;//记得要这句话,否则如果关闭先前的终端,又会出现原来的错误 mysql> /q
方法二:
1.关闭mysql # service mysqld stop2.屏蔽权限 # mysqld_safe --skip-grant-table 屏幕出现: Starting demo from .....3.新开起一个终端输入 # mysql -u root mysql mysql> delete from user where USER=''; mysql> FLUSH PRIVILEGES;//记得要这句话,否则如果关闭先前的终端,又会出现原来的错误 mysql> /q
2. 一开始无法备份自己创建的数据库,添加了ROOT密码后,成功备份。
密码设置:
UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
备份语句:
mysqldump -u root -p111 weixin > /usr/mysqlbak/1.sql
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