1.作成shell文件
Shell文件 ：
DB_NAME='lyz'
USER='root'
PWD='root'
TIME=$(date +%Y%m%d)
DEL_TIME=$(date --date="7 days ago" +%Y%m%d)
DB_BAK_NAME=tdc_debug${TIME}.sql
DB_DEL_NAME=tdc_debug${DEL_TIME}.sql
BACKUP_PATH='/home/zhaoqun/DB_BAK/day_bak/'
echo $BACKUP_PATH$DB_BAK_NAME
if test -f $BACKUP_PATH$DB_DEL_NAME
then
echo "Delete history dump file"
rm -f $BACKUP_PATH$DB_DEL_NAME
fi
mysqldump -u $USER -p$PWD $DB_NAME>$BACKUP_PATH$DB_BAK_NAME
2.修改/etc/crontab ，定制任务计划
/etc/crontab 中追加
01 16 * * * root /home/lyz/DB_BAK/day_bak/day_bak.sh
每天的 16：01 分进行MYSQL 备份， 并保持7天的备份履历。
