可以将这个脚本放进crontab，他的配制文件在 /etc/crontab中每天凌晨执行一次，自动备份 这个脚本每天最多只执行一次，而且只保留最近五天的备份在服务器上。

#!/bin/bash

#This is a ShellScript For Auto DB Backup

#Powered by aspbiz

#2004-09

#Setting

#设置数据库名，数据库登录名，密码，备份路径，日志路径，数据文件位置，

#以及备份方式

#默认情况下备份方式是tar，还可以是mysqldump,mysqldotcopy

#默认情况下，用root(空)登录mysql数据库，备份至/root/namexxxxx.tgz

DBName=mysql

DBUser=root

DBPasswd=password

BackupPath=/root/

LogFile=/root/db.log

DBPath=/var/local/mysql5/var/

#BackupMethod=mysqldump

#BackupMethod=mysqlhotcopy

#BackupMethod=tar

#Setting End

NewFile="$BackupPath""$DBName"$(date +%y%m%d).tgz

DumpFile="$BackupPath""$DBName"$(date +%y%m%d)

OldFile="$BackupPath""$DBName"$(date +%y%m%d --date='5 days ago').tgz

echo "-------------------------------------------" >> $LogFile

echo $(date +"%y-%m-%d %H:%M:%S") >> $LogFile

echo "--------------------------" >> $LogFile

#Delete Old File

if [ -f $OldFile ]

then

   rm -f $OldFile >> $LogFile 2>&1

   echo "[$OldFile]Delete Old File Success!" >> $LogFile

else

   echo "[$OldFile]No Old Backup File!" >> $LogFile

fi

if [ -f $NewFile ]

then

   echo "[$NewFile]The Backup File is exists,Can't Backup!" >> $LogFile

else

   case $BackupMethod in

   mysqldump)

      if [ -z $DBPasswd ]

      then

         mysqldump -u $DBUser --opt $DBName > $DumpFile

      else

         mysqldump -u $DBUser -p$DBPasswd --opt $DBName > $DumpFile

      fi

      tar czvf $NewFile $DumpFile >> $LogFile 2>&1

      echo "[$NewFile]Backup Success!" >> $LogFile

      rm -rf $DumpFile

      ;;

   mysqlhotcopy)

      rm -rf $DumpFile

      mkdir $DumpFile

      if [ -z $DBPasswd ]

      then

         mysqlhotcopy -u $DBUser $DBName $DumpFile >> $LogFile 2>&1

      else

         mysqlhotcopy -u $DBUser -p $DBPasswd $DBName $DumpFile >>$LogFile 2>&1

      fi

      tar czvf $NewFile $DumpFile >> $LogFile 2>&1

      echo "[$NewFile]Backup Success!" >> $LogFile

      rm -rf $DumpFile

      ;;

   *)

      /etc/init.d/mysqld stop >/dev/null 2>&1

      tar czvf $NewFile $DBPath$DBName >> $LogFile 2>&1

      /etc/init.d/mysqld start >/dev/null 2>&1

      echo "[$NewFile]Backup Success!" >> $LogFile

      ;;

   esac

fi

echo "-------------------------------------------" >> $LogFile 

其他手动备份

mysqldump -uroot -p(密码) 数据名称 > 数据名称.sql

例：mysqldump -uroot -plingzhong emlog > emlog.sql

还原

mysql -uroot -p(密码) 数据名 < 数据名.sql