• MySQL_DBA整理


     MySQL_DBA整理(转) 2011-01-26 16:51:41

    分类: Mysql/postgreSQL

    转自:丁丁:http://www.itpub.net/thread-831154-2-1.html

     mysql_dba_备份与还原部分介绍.doc (72 KB) 

    MySQL_DBA整理

    前言

           几乎所有的资料整理都在Linux系统、mySQL5.0.27版本和MyISAM存储引擎环境下试验和总结的,以及参考前人经验与MySQL官网资料进行总结的。关于MySQL 的安装与升级,我相信很多MySQL_DBA都比我厉害,MySQL官网与其他网站上应该有很多相关资料:

             关于安装写一条简单的命令与一些必要的说明:

             1. 源码安装的脚本

    ./configure --prefix=/usr/local/mysql --with-mysqld-user=mysql --with-charset=gb2312 --with-extra-charsets=all

           由于我的数据库只使用gb2312,所以为了一致性就这样设置,你也可以设置为自己的类型。

             2.必要说明:

             为了方便程序的升级以及性能更高,应该把MySQL程序与数据文件放在不同的目录下面,最好还是不同的磁盘上。若起用了日志功能,最好是把MySQL程序、数据文件和日志文件分别放在三个不同的磁盘上,从而避免程序升级带来的潜在而致命的问题,提高数据的读写能力(注:毕竟磁盘的转速有限)。

    第一部分:数据库的备份与还原

          对于MyISAM 存储引擎的表,由于只有表级的锁,所以目前还没有出现象InnoDB存储引擎的那种可以不缩定表的备份方法。目前用得最多最普遍的两种方法:文件的拷贝与dump数据库。

           文件的拷贝:就是在备份期间锁定数据库表,不允许其他用户进行任何更新操作,然后直接把*.MYD

    、*MYI、db.opt文件拷贝到备份的目录下。一般使用免费的工具:mysqlhotcopy,至于如何使用会在备份脚本中给出参考,但是该方法没有办法备份存储过程、函数等,但是另系统库(mysql)一起备份的话,是可以实现备份存储过程、函数等的效果。

           Dump方法:也是非常类似,就是把指定数据库的所有数据表结构与数据生成Create 与Insert语句。

           总结:这两种方法各有优劣,需要看根据实际情况使用那种备份方法。

           1>、文件拷贝:此方法备份的速度快,锁定表的时间相对短,且恢复起来也非常快。但是恢复的时候,一般需要在同一种类型的系统、MySQL版本上进行恢复备份的数据库文件。缺乏跨平台的、跨版本等缺点。

           2>、Dump:此方法备份的速度慢,锁定表的时间长,且恢复起来也慢。可是此种备份的文件,具有跨平台、跨版本、跨存储引擎(备份时设置好就可以)等优势。

           介于上面的描述,我们应该是两种方法结合。比如:平时进行完整备份时,可以采用文件拷贝的方式;对于备份的文件需要放到不同类型系统平台的或不同 MySQL版本上再进行还原话,建议采用Dump方式。建议以上两种备份方式可以只作为完整备份的方式,若需要精确到秒的话,可以考虑:

    文件拷贝+日志备份 或Dump+日志备份,最好是采用文件拷贝+日志备份。至于备份的频率,需要根据自己的系统特点与数据重要指定。在此介绍一种比较普遍的策略:

           每天的05:00:00左右进行完整备份,然后每小时进行一次日志文件备份。(注意:日志文件太大的话,使用MySQL客户端工具进行重做的话,会比较慢)。

     

    下面给出完使用mysqlhotcopy工具备份与自动还原的代码:

    完整备份:

    #!/bin/bash

    #First,create direct /back

    # setting servername

    server=test

     

    #the directory of backup

    backdir=/back/mysql

     

    #use log file record log

    logfile=$backdir/mysqlbak.log

     

    today=`date +%y-%m-%d`

    todaydir=$server-$today

    backup=$backdir/$todaydir

     

    #the password of mysql

    rootpass=123456a

    dbname=eugene

     

    #remake the directory of backup

    if [ ! -d $backdir ] ; then

       mkdir $backdir

    else

       chattr -i $backdir

    fi

     

    cd $backdir

     

    if [ ! -f $logfile ] ; then

        touch $logfile

    else

        chattr -i $logfile

    fi

     

    echo "             " >> $logfile

    echo "fully backup starting!" >> $logfile

    echo $(date +"%y%m%d %h:%m%s") >> $logfile

    echo "             " >> $logfile

     

    mkdir $backup

     

    #backup with database

    /usr/local/mysql/bin/mysqlhotcopy $dbname --flushlog -u admin -p $rootpass $backup | logger -t mysqlhotcopy

     

    echo "fully backup database success!" >> $logfile

     

    #compress backup file and deleted unregimented file

    cd $backdir

    tar -zcf $todaydir.tgz $todaydir/$dbname/

    rm -rf $todaydir

     

    #cd $backdir

    #Keep Down Thirty Days

    for f in `find . -type f -mtime +30 -maxdepth 1`

    do

     filename=`basename $f`

     #can't deleted log file

     if [ $f != 'mysqlbak.log' ] ; then

        rm -fr $f

     fi

    done

    #add property

    chattr +i $backdir

     

     

    日志备份:

    #!/bin/bash

    #everyday and hourly backup log files once

    #setting server's name

    server=test

    #log files's directory

    logfile=/usr/local/mysql/var

    #the directory of backup

    backdir=/back/increment

    hourly=`date +"%y-%m-%d-%H-%M-%S"`

    today=`date +%y-%m-%d`

    todaydir=$backdir/$server-$today

    hourlydir=$server-$hourly

    backupdir=$todaydir/$hourlydir

    rootpass=123456a

    #create directory ,but back is exist

    #increment is exist or bot exist,General,first It need creatting

    if [ ! -d $backdir ] ; then

       mkdir $backdir

    else

       chattr -i $backdir

    fi

    #judge today directory is exist or not exist

    if [ ! -d $todaydir ] ; then

        mkdir $todaydir

    else

        chattr -i $todaydir

    fi

    #create directory is using storage log files

    mkdir $backupdir

    #execute flush logs

    /usr/local/mysql/bin/mysqladmin -u admin -p$rootpass flush-logs

    #stat mysql-bin log file total, throw off lastly and mysql-bin.index

    total1=`ls $logfile/mysql-bin.*|wc -l`

    total=$(expr $total1 - 2)

    for f in `ls $logfile/mysql-bin.*|head -n $total`

    do

      mv $f $backupdir

    done

    #compress log files

    cd $todaydir

    #Because file'name include mark of : ,it will make a mistake,So we dispart two-step complete

    tar -zcf $hourlydir.tgz $hourlydir/

    rm -rf $hourlydir

    #deleted overdue files and directs

    cd $backdir

    #Keep Down Thirty Days;deleted *.tgz file

    for d in `find . -type d -mtime +30 -maxdepth 1`

    do

      #filename=`basename $f`

      rm -fr $d

    done

    # alter file and directory  property

    chattr +i $backdir

     

     

     

     

     

     

     

     

     

     

    自动还原:

    #!/bin/bash

    #this is restore database script

    #author:eugene

    #date:2007-07-26

    #***************Define Begin***************************#

    #fully backup database file directory

    fulldir=/back/mysql

    #increment backup log file directory

    incrementdir=/back/increment

    #it is mysqlbinlog's directory

    bindir=/usr/local/mysql/bin

    vardir=/usr/local/mysql/var

    para=07-08-15

    time=04

     

    #setting fully backup database at 05:30

    backuptime=05

    #databse'sname

    dbname=eugene

    #root's password

    passwrd=123456a

    #log file's name

    logfile=mysql-bin

     

    #*************** Define End ***************************#

     

    #*************** Function Start************************#

    #parameter: yy-mm-dd

    #return: max(day)

    mon_max_day()

    {

     day=0

    #Because parameter of date's format yy-mm-dd,so we must convert to yyyy-mm-dd

     year=$( expr $2 + 2000 )

     if [ $1 -gt 0 -a $1 -lt 13 ]; then

        case $1 in

                  1|01|3|03|5|05|7|07|8|08|10|12) day=31;;

                  4|04|6|06|9|09|11) day=30;;

                  2|02)

                      if [ `expr $year % 4` -eq 0 ] ; then

                            if [ `expr $year % 400` -eq 0 ] ; then

                                    day=29

                            elif [ `expr $year % 100` -eq 0 ] ; then

                                    day=28

                            else

                                    day=29

                            fi

                       else

                            day=28

                       fi

        esac

    fi

    echo $day

    }

     

    #usage: get discretionary date's yesterday date,parameter:yy-mm-dd

    #return: yy-mm-dd

    yesterday()

    {

     num=$1

     year=$(echo $num|awk -F- '{print $1}')

     month=$(echo $num|awk -F- '{print $2}')

     day=$(echo $num|awk -F- '{print $3}')

     

     day=$(expr $day - 1)

     if [ $day -eq 0 ] ; then

        month=$(expr $month - 1)

     

        if [ $month -eq 0 ] ; then

           year=$(expr $year - 1)

           month=12

        fi

     

        day=$(mon_max_day $month $year)

        value=$year-$month-$day

     

     else

        value=$year-$month-$day

     fi

     echo $value

    }

     

    #parameter: $1---yy-mm-dd; $2---0 or 1 or 2 or 3; $3---fulldir;$4---vardir

    #0---copy current day's file,

    #1---copy yesterday day's file

    #2---copy last month day's file

    #3---copy last year day's file

     

    fullycp()

    {

      strdate=$1

      num=$2

      fullydir=$3

      vardir=$4

     

      year=$(echo $strdate | awk -F- '{print $1}') #create directory's year

      month=$(echo $strdate | awk -F- '{print $2}') #create directory's  month

      day=$(echo $strdate | awk -F- '{print $3}') #create directory's day

     

      case $num in

                  0) ;;

                  1|2|3) strdate=$(yesterday $strdate)

                         year=$(echo $strdate | awk -F- '{print $1}') #create directory's year

                         month=$(echo $strdate | awk -F- '{print $2}') #create directory's  month

                         day=$(echo $strdate | awk -F- '{print $3}') #create directory's day

                     ;;

        esac

     

     for f in `ls $fullydir`

         do

            #if [ -d $fullydir/$f ] ; then

             filename=`basename $f`

             if [ $filename!='mysqlbak.log' ] ; then   #test catalog include mysqlbak.log,so filt the file

     

               num1=$(echo $f | awk -F- '{print $2}') #create directory's year

               num2=$(echo $f | awk -F- '{print $3}') #create directory's  month

               num4=$(echo $f | awk -F- '{print $4}') #create directory's day.tgz

               num3=$(echo $num4 | awk -F. '{print $1}') #create directory's day

     

               if [ $year -eq $num1 -a $month -eq $num2 -a $day -eq $num3 ] ; then

                   echo "success!"

                   tar zxvf $f

                   cp -rf $fullydir/$f/$dbname $vardir

               fi

            fi

        done

    }

     

    #*************** Function End************************#

    #alter back/increment directory attribute

    chattr -i $incrementdir

     

    year=$(echo $para | awk -F- '{print $1}')

    month=$(echo $para | awk -F- '{print $2}')

    day=$(echo $para | awk -F- '{print $3}')

     

    #shutdown mysql service

    #Judge mysqld is running or stopping

    #for d in `ps -e|grep mysql|awk '{ print $4 }'`

    #do

    #  if [ $d == 'mysqld' ] ; then

    #     #/etc/init.d/mysql stop

    #   fi

    #done

     

    if [ $backuptime  -lt $time ] ; then  #05 < time

      

      #deal with fully backup files with  transfer function fullycp($strdate $flag $fulldir $vardir)

      fullycp $para 0 $fulldir $vardir

      

      #deal with log files

      for f1 in `ls $incrementdir`

         do

           num1=$(echo $f1 | awk -F- '{print $2}') #create directory's year

           num2=$(echo $f1 | awk -F- '{print $3}') #create directory's  month

           num3=$(echo $f1 | awk -F- '{print $4}') #create directory's day

          

           if [ -d $incrementdir/$f1 ] ; then  #judge target is file or director

     

            if [ $year -eq $num1 -a $month -eq $num2 -a $day -eq $num3 ] ; then

                     for f2 in `ls $incrementdir/$f1`

                     do

                       bf2=$(echo $f2 | awk -F: '{print $1}')

                       bf3=$(echo $bf2 | awk -F- '{print $5}')

     

                      if [ $bf3 -le $time ] ; then   #bf3 <= time

                         for f4 in `ls $incrementdir/$f1/$f2/$logfile.*|head`

                             do

                              $bindir/mysqlbinlog --database=$dbname $f4 >> $incrementdir/test.sql

                             done

                       fi

                      done

                fi

             fi

          done

    else

    #Because fully backup event is happened in 05:30,so use yesterday's fully backup ,

    #and deal with yesterday's log file and intraday's log files

    #don't consider restore every month's first day ,must be considered

     

       #deal with yesterday's fully backup files with  transfer function fullycp($strdate $flag $fulldir $vardir)

       fullycp $para 1 $fulldir $vardir

       

        curryear=$(echo $para | awk -F- '{print $1}')

        currmonth=$(echo $para | awk -F- '{print $2}')

        currday=$(echo $para | awk -F- '{print $3}')

      

       #get the current's date of yesterday's date  

       lastdate=$(yesterday $para)

     

       lastyear=$(echo $lastdate | awk -F- '{print $1}')

       lastmonth=$(echo $lastdate | awk -F- '{print $2}')

       lastday=$(echo $lastdate | awk -F- '{print $3}')

     

         

        #need deal with currently and yesterday log files

     

            #first,deal with year-mm-(day - 1)'s log files

            for f1 in `ls $incrementdir`

               do

                 if [ -d $incrementdir/$f1 ] ; then  #judge target is file or director

                    num1=$(echo $f1 | awk -F- '{print $2}') #create directory's year

                    num2=$(echo $f1 | awk -F- '{print $3}') #create directory's  month

                    num3=$(echo $f1 | awk -F- '{print $4}') #create directory's day

                    

                           

                    if [ $lastyear -eq $num1 -a $lastmonth -eq $num2 -a $lastday -eq $num3 ] ; then

                       for f2 in `ls $incrementdir/$f1`

                         do

                           bf2=$(echo $f2 | awk -F: '{print $1}')

                           bf3=$(echo $bf2 | awk -F- '{print $5}')

     

                           if [ $bf3 -ge $backuptime ] ; then   #bf3 >= backuptime or backuptime - 1

                              for f4 in `ls $incrementdir/$f1/$f2/$logfile.*|head`

                                 do

                                   $bindir/mysqlbinlog --database=$dbname $f4 >> $incrementdir/test.sql

                             done

                           fi

                         done

                     elif [ $curryear -eq $num1 -a $currmonth -eq $num2 -a $currday -eq $num3 ] ; then

                          for f2 in `ls $incrementdir/$f1`

                            do

                               bf2=$(echo $f2 | awk -F: '{print $1}')

                               bf3=$(echo $bf2 | awk -F- '{print $5}')

     

                             if [ $bf3 -le $time ] ; then  #bf3 <=time

                                for f4 in `ls $incrementdir/$f1/$f2/$logfile.*|head`

                                 do

                                   $bindir/mysqlbinlog --database=$dbname $f4 >> $incrementdir/test.sql

                                 done 

                              fi

                            done

                      fi

                   fi

                 done      

    fi

     

    if [ -f $incrementdir/test.sql ] ; then

       sed '/^ROLLBACK/ d' $incrementdir/test.sql > $incrementdir/template.sql

    else

       echo "don't exist backup database files!"

       exit

    fi

    #start mysql service

    #must copy mysql.mysql to /etc/init.d/mysql

    #/etc/init.d/mysql start

    /usr/local/mysql/bin/mysql -uadmin -p$passwrd $dbname < $incrementdir/template.sql

    rm $incrementdir/test.sql

    rm $incrementdir/template.sql

    #add /back/increment directory attribute

    chattr +i $incrementdir

    对此申明下:本人的Shell脚本属于现学现卖的那种,我知道这些脚本肯定可以写得更简单,其实我写的自动还原的脚本是一种特殊情况下用的。。。比如有N 多天前的完整备份存在问题,而只有N+1条的完整备份是完好的,所以需要使用N+1前天的完整备份再加上N+1 条到目前的日志完整,若N>=2条的话,日志就有很多了,手工还原就麻烦,这个脚本就有用了。

           对于游戏、金融等行业需要只针对某个帐号的信息进行回档处理,在MySQL5.0及以上的版本就非常容易了,只要根据需要回档的时间,就可以使用此时间段的日志文件进行回档,二进制日志翻译的语句如下:

    usr/local/mysql/bin/mysqlbinlog –start_datetime=”2007-10-29 05:21:00” –stop_datetime=” 2007-10-29 05:25:00 ”  eugene.01831 > mysql –uroot –p Eugene

    解释下:只要需要翻译某段时间之间的二进制的日志,可以指定start_datetime与stop_datetime,不指定则是把eugene.01831日志文件全部翻译成SQL语句并且通过mysql客户端工具执行,eugene为指定在那个数据库上执行生成的SQL语句。

          以游戏行业恢复某个玩家角色的物品为例解释下,可能会比较好理解。假设A 玩家在2007-10-29 03:24:00至 2007-10-29 03:29:00之间出现装备丢失。

            若update语句的where 条件是根据角色的编号ID,我们可以先根据角色名称找到对应的ID(社为1001),然后再执行:

    usr/local/mysql/bin/mysqlbinlog –start_datetime=” 2007-10-29 03:24:00” –stop_datetime=” 2007-10-29 03:29:00 ”  eugene.01832 > Eugene.sql,再把eugene.sql放到eugene.doc文档中查找下ID=1001的update角色表的语句,复制出来并稍微修改下再利用客端 执行下修改后的update语句就可以实现只更改装备的数据了。

          

     

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  • 原文地址:https://www.cnblogs.com/L-H-R-X-hehe/p/4004697.html
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