《Mysql应用linux下改良版本mysqldump来备份MYSQL数据库》要点：
本文介绍了Mysql应用linux下改良版本mysqldump来备份MYSQL数据库，希望对您有用。如果有疑问，可以联系我们。
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.
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