mysql备份
增量备份：
每天中午12点和晚上12点做一次全备，每隔一小时备份binlog,也就是增量备份，具体操作如下：
Linux下开启binlog
/etc/my.cnf中的mysqld部分加入:
[mysqld]
log-bin=../logs/mysql-bin
max-binlog-size=50M
############################
#cat mysql_full.sh
!/bin/sh
# mysql data backup script #
# use mysqldump --help,get more detail.
BakDir=/backup/mysql
LogFile=/backup/mysql/mysqlbak.log
DATE=`date +%Y%m%d`
echo " " >> $LogFile
echo " " >> $LogFile
echo "-------------------------------------------" >> $LogFile
echo $(date +"%y-%m-%d %H:%M:%S") >> $LogFile
echo "--------------------------" >> $LogFile
cd $BakDir
DumpFile=$DATE.sql
GZDumpFile=$DATE.sql.tgz
mysqldump -uroot -pXXXX --quick --all-databases --flush-logs --delete-master-logs --lock-all-tables > $DumpFile
echo "Dump Done" >> $LogFile
tar czvf $GZDumpFile $DumpFile >> $LogFile 2>&1
echo "[$GZDumpFile]Backup Success!" >> $LogFile
rm -f $DumpFile
cd $BakDir/daily
rm -f *
cd $BakDir
echo "Backup Done!"
echo "please Check $BakDir Directory!"
echo "copy it to your local disk or ftp to somewhere !!!"
ls -al $BakDir
####################
增量备份代码
#!/bin/sh
# mysql binlog backup script
mysqladmin -uroot -pXXXX flush-logs
DATADIR=/www/wdlinux/mysql/var
BAKDIR=/backup/mysql/daily
###如果你做了特殊设置,请修改此处或者修改应用此变量的行cd $DATADIR
FILELIST=`cat *-bin.index`
##计算行数,也就是文件数
COUNTER=0
for file in $FILELIST
do
COUNTER=`expr $COUNTER + 1 `
done
NextNum=0
for file in $FILELIST
do
base=`basename $file`
NextNum=`expr $NextNum + 1`
if [ $NextNum -eq $COUNTER ]
then
echo "skip lastest"
else
dest=$BAKDIR/$base
if(test -e $dest)
then
echo "skip exist $base"
else
echo "copying $base"
cp $base $BAKDIR
fi
fi
done
echo "backup mysql binlog ok"
#################################
增量备份脚本是备份前flush-logs,mysql会自动把内存中的日志放到文件里,然后生成一个新的日志文件,所以我们只需要备份前面的几个即可,也就是不备份最后一个.
因为从上次备份到本次备份也可能会有多个日志文件生成,所以要检测文件,如果已经备份过,就不用备份了.
数据还原：
先还原最近的完全备份数据：
mysql -hhostname -uusername -ppassword databasename < backupfile.sql
再还原binlog ：
./mysqlbinlog --start-date="2009-04-10 17:30:05" --stop-date="2009-04-10 17:41:28" /usr/local/mysql/data/mysql-bin.000002 |mysql -u root -p123456