使用类型：系统负载集中在某那个时间段，如白天8小时，晚上基本很闲，所以在晚上就可以对数据进行备份

与之相对应的是全库备份：

http://blog.csdn.net/jacson_bai/article/details/39636915

1、ENV:
IP: 10.244.171.180/181
Oracle database  Oracle 11.2.0.3
OS RHEL 5.5
Backup Toos:RMAN，shell,crontab

2、备份计划（增量计划）
Sunday   :execute level 0 incremental back
Monday   :execute level 2 incremental back
Tuesday  :execute level 2 incremental back
Wednesday:execute level 1 incremental back
Thursday :execute level 2 incremental back
Friday   :execute level 2 incremental back
Saturday :execute level 2 incremental back
  
3、在Node2规划backup 目录
--先创建保存备份脚本的目录
$mkdir -p /Data/scripts/rman/
--创建备份数据的目录
$mkdir -p /Data/rmandata/ --存放备份的数据目录

3、制定*.sql和rman_backup.sh脚本

 --全备lv0级：
$cd /Data/scripts/rman/
$vi backup_lv0.sql
  run{
  allocate channel c1 type disk;
  allocate channel c2 type disk;
  allocate channel c3 type disk;
  allocate channel c4 type disk;
  backup incremental level 0 database
  include current controlfile format ‘/Data/rmandata/backup_%T_%s_%U_%t.lv0‘
  plus archivelog delete all input format ‘/Data/arch/backup_%T_%s_%p_%t.arc‘;
  release channel c1;
  release channel c2;
  release channel c3;
  release channel c4;
  }
--增量备lv1级：
vi backup_lv1.sql
  run{
  allocate channel c1 type disk;
  backup incremental level 1 database include current controlfile
  format ‘/Data/rmandata/backup_%T_%s_%p.lv1‘;
  release channel c1;
  }
--累计备lv2级：
$vi backup_lv2.sql
  run{
  allocate channel c1 type disk;
  backup incremental level 2 database include current controlfile
  format ‘/Data/rmandata/backup_%T_%s_%p.lv2‘;
  release channel c1;
  }

4、编写shell脚本
--脚本要实现的功能：
1.正确判断星期
2.记录每个rman备份运行的时间

#!/bin/bash
source /home/oracle/.bash_profile
myweek=`date +%a`
mydate=`date +%Y%m%d`
mydir=/Data/
#Monday
if [ "$myweek" == "Mon" ]; then
rman target sys/oracle msglog=${mydir}/backup_${mydate}.log cmdfile=${mydir}/scripts/rman/backup_lv2.sql
fi
#Tuesday
if [ "$myweek" == "Tue" ]; then
rman target sys/oracle msglog=${mydir}/backup_${mydate}.log cmdfile=${mydir}/scripts/rman/backup_lv2.sql
fi
#Wednesday
if [ "$myweek" == "Wed" ]; then
rman target sys/oracle msglog=${mydir}/backup_${mydate}.log cmdfile=${mydir}/scripts/rman/backup_lv1.sql
fi
#Thursday
if [ "$myweek" == "Thu" ]; then
rman target sys/oracle msglog=${mydir}/backup_${mydate}.log cmdfile=${mydir}/scripts/rman/backup_lv2.sql
fi
#Friday
if [ "$myweek" == "Fri" ]; then
rman target sys/oracle msglog=${mydir}/backup_${mydate}.log cmdfile=${mydir}/scripts/rman/backup_lv2.sql
fi
#Saturday
if [ "$myweek" == "Sat" ]; then
rman target sys/oracle msglog=${mydir}/backup_${mydate}.log cmdfile=${mydir}/scripts/rman/backup_lv2.sql
fi
#Sunday
if [ "$myweek" == "Sun" ]; then
rman target sys/oracle msglog=${mydir}/backup_${mydate}.log cmdfile=${mydir}/scripts/rman/backup_lv0.sql
fi

5、crontab脚本指定
$crontab -e
30 20 * * * sh /Data/script/rman/rman_backup.sh;

rman备份方法之-增量备份