编写 db_backup.sh 文件

• 使用mysqldump 命令进行数据备份
• 删除七天前的历史记录

#!/bin/bash    
mysqldump -uroot -h127.0.0.1 -pxxx dbName | gzip > /usr/local/java/mysql/backup/dbName_$(date +%Y%m%d_%H%M%S).sql.gz

workdir="/usr/local/java/mysql/backup/"

do_delete()
{
    echo file name is $workdir 

        find $workdir -name '*.sql.gz' -and -mtime +7  -type f  -delete
        if [ $? -eq 0 ];then
            echo $date delete $dir success!             
        else
            echo $date delete $dir FAILD!            
         fi

}
do_delete

给 db_backip.sh 文件添加可执行权限

chmod u+x db_backup.sh

添加定时任务，

// 命令
crontab -e 
// 键入cron 表达式
0 01 * * * /usr/local/java/mysql/backup/db_backup.sh

注意

• 问题：使用mysqldump 备份是报ERROR 1449 错误
  错误信息如下：

mysqldump: Got error: 1449: The user specified as a definer ('xxx'@'%') does not exist when using LOCK TABLES

解决办法【授权】：

GRANT ALL PRIVILEGES ON *.* TO 'xxx'@'%' IDENTIFIED BY '密码' WITH GRANT OPTION;