编写批处理脚本：
#!/bin/sh
# source /home/oracle/.bash_profile

PATH=$PATH:$HOME/bin

export PATH

export ORACLE_BASE=/opt/oracle
export ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1
export ORACLE_SID=tumooracle
export PATH=$PATH:$HOME/bin:$ORACLE_HOME/bin
export NLS_LANG=AMERICAN_AMERICA.ZHS16GBK
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME/lib:/usr/lib:/usr/local/lib
export SQLPATH=/opt/oracle/product/11.2.0/db_1/sqlplus/admin

rman target / log=/u02/rman/logs/db_fullbak_tumo_`date +%Y%m%d%H%M`.log <<EOF
run {
  configure retention policy to recovery window of 14 days;
  configure controlfile autobackup on;
  configure controlfile autobackup format for device type disk to '/opt/oracle/oradata/backup/%F';
  configure archivelog deletion policy to applied on standby;
  allocate channel c1 device type disk format '/opt/oracle/oradata/backup/BAK_%U';
  backup database skip inaccessible 
    plus archivelog filesperset 2
    delete input;
  backup current controlfile;
  release channel c1;
  crosscheck backup;
  delete noprompt obsolete;
}
EOF

保存为 /u02/script/db_fullback_tumo.sh

设定执行任务
crontab -e 
添加如下：
0 24 * * * /u02/script/db_fullback_tumo.sh
(*/3 * * * * /u02/script/db_fullback_tumo.sh)
注，括号内的可以是做测试的时候用的，每分钟执行一次备份，例为每天凌晨24点执行备份

执行验证
在root 下执行 tail -f /var/log/cron 监视crontab 日志




查看对应目录是否生成了备份文件：
cd /opt/oracle/oradata/backup
ll



可以进一步查看 rman 日志看备份过程是否有错误。

参考：
《涂抹ORACLE-三思笔记之一步一步学Oracle》
http://www.2cto.com/os/201109/106291.html
http://blog.sina.com.cn/s/blog_67be3b45010180wy.html