改良版本mysqldump来备份MYSQL数据库

我的备份脚本都是在凌晨执行的，经常在慢查询日志里面看到这样的信息：select * from table1; 之前一直很纳闷，最后才了解到原来是MYSQLDUMP搞的鬼。因为MYSQLDUMP会为整个库来加一个全局锁定。如果单纯用MYSQLDUMP进行全库备份会造成以下三个方面的影响。 1、服务器CPU严重阻塞。 2、磁盘I/O直线增加。 3、所有的查询都成了慢查询。我现在的网站数据库大概是5个G左右，而且每天都有增大。表结构是MYISAM,INNODB,MEMORY三者混合。所以单纯用HOTCOPY工具恐怕有点困难。所以我今天简单变了一下我上次写的关于用OUTFILE来备份MYSQL的脚本。可以解决上面说的三个缺点。 1、备份脚本内容 [david_yeung@localhost ~]$ cat fast_backup #!/bin/sh # # Created by david yeung. # # 20080707. # # Backup mysql's full data. # DBNAME=$1 BACKUPDIR=/home/david_yeung/backup_new USERNAME=backup_user PASSWD=123456 TARNAME="$BACKUPDIR"/backup"$1"`date '+%Y%m%d'` # Add your own database name here. case "$1" in my_site);; *) exit;; esac # Get all the tables' name. NUM=`/usr/local/mysql/bin/mysql -u$USERNAME -p$PASSWD -s -vv -e "show tables" -D $DBNAME|wc -l` HEADNUM=`expr ${NUM} - 3` TAILNUM=`expr ${NUM} - 7` ARR1=`/usr/local/mysql/bin/mysql -u$USERNAME -p$PASSWD -s -vv -e "show tables" -D $DBNAME| head -n"$HEADNUM" | tail -n "$TAILNUM"` ARR2=($ARR1) i=0 while [ "$i" -lt "${#ARR2[@]}" ] do tmpFileName=${ARR2[$i]} # The real dump process. /usr/local/mysql/bin/mysqldump -u$USERNAME -p"$PASSWD" "$DBNAME" "$tmpFileName" >> "$TARNAME" let "i++" done 2、因为我们一直用存储过程，所以得单独备份出来。 [david_yeung@localhost ~]$ cat fast_sp #!/bin/sh # Created by david yeung 20080122. # # Backup site's routine. TARNAME=/home/david_yeung/backup_new/spBackup"$1"`date '+%Y%m%d'` /usr/local/mysql/bin/mysqldump -ubackup_user -p123456 -n -t -d -R my_site > "$TARNAME" 3、丢到计划任务里面去，就不管了。 [root@localhost backup_new]# crontab -l 0 01 * * * /home/david_yeung/fast_backup my_site 0 0 * * 5 /home/david_yeung/fast_sp 每天凌晨1点备份数据，每个周五凌晨备份存储过程。 4、因为有人说碰到要恢复单表的数据，所以把备份单表脚本也贴上。 #!/bin/sh # # Created by david yeung. # # 20080707. # # Backup mysql's full data. # DBNAME=$1 USERNAME=backup_user PASSWD=123456 PREFIX=/home/david_yeung/backup_new/ DIRNAME=$PREFIX`date '+%Y%m%d'` echo $TARNAME # Add your own database name here. case "$1" in t_girl);; *) exit;; esac if [ ! -d "$DIRNAME" ] then mkdir "$DIRNAME" fi # Get all the tables' name. NUM=`/usr/local/mysql/bin/mysql -u$USERNAME -p$PASSWD -S/tmp/mysql50.sock -s -vv -e "show tables" -D $DBNAME|wc -l` HEADNUM=`expr ${NUM} - 3` TAILNUM=`expr ${NUM} - 7` ARR1=`/usr/local/mysql/bin/mysql -u$USERNAME -p$PASSWD -S/tmp/mysql50.sock -s -vv -e "show tables" -D $DBNAME| head -n"$HEADNUM" | tail -n "$TAILNUM"` ARR2=($ARR1) i=0 while [ "$i" -lt "${#ARR2[@]}" ] do tmpFileName=${ARR2[$i]} # The real dump process. /usr/local/mysql/bin/mysqldump -u$USERNAME -p"$PASSWD" -S/tmp/mysql50.sock "$DBNAME" "$tmpFileName" > "$DIRNAME"/"$tmpFileName" let "i++" done