在前面的单实例数据库迁移至rac环境配置过程中（见  ），介绍了使用standby技术构建单实例主库对应rac物理备库的data guard模型，本节中将介绍rac主库对应单实例物理备库的data guard模型构建；在MAA架构中，ASM提供了存储方面的网格，RAC提供了数据库层面上的网格计算，data guard则着重强调在数据的备份和容灾方面，更多MAA方面的知识，参考下面的链接!
http://www.oracle.com/technetwork/database/features/availability/maa-090890.html

一：主备库的环境介绍
主库：
数据库版本：10.2.0.5
OS版本：CentOS4.8 64位
数据库名：rac（两个实例）
实例名：rac1,rac2
IP地址:192.168.1.41/24,192.168.1.42/24
db_unique_name: rac
服务名：rac.yang.com
监听器端口：1521
存储类型：OMF+ASM磁盘组，+DATA,+FRA

备库：
数据库版本：10.2.0.5
OS版本：rhel5.4 64位
数据库名：rac （单实例）
实例名：orcl
IP地址:192.168.1.49/24
db_unique_name: orcl
服务名：orcl.yang.com
监听器端口：1521
存储类型：文件系统+OMF

在开始前确保主库rac环境正常，备库只需要安装数据库软件即可，不需要建库

二：配置监听器和tnsnames.ora文件如下，rac节点2上需要同样进行配置

[oracle@rac1 ~]$ cat $ORACLE_HOME/network/admin/listener.ora
LISTENER_RAC1 =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.yang.com)(PORT = 1521)(IP = FIRST))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.41)(PORT = 1521)(IP = FIRST))
    )
  )

SID_LIST_LISTENER_RAC1 =
  (SID_LIST =
    (SID_DESC =
      (ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
      (GLOBAL_DBNAME=rac_DGMGRL.yang.com)
      (SID_NAME = rac1)
    )
  )

[oracle@rac1 ~]$ sqlplus as sysdba
SQL*Plus: Release 10.2.0.5.0 - Production on Thu Jan 12 10:56:05 2012
Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
SQL>

[oracle@rac1 ~]$ cat $ORACLE_HOME/admin/tnsnames.ora
LISTENERS_RAC =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.yang.com)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.yang.com)(PORT = 1521))
  )

LISTENER_RAC1 =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.yang.com)(PORT = 1521))
  )

LISTENER_RAC2 =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.yang.com)(PORT = 1521))
  )

RAC =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.yang.com)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.yang.com)(PORT = 1521))
    (LOAD_BALANCE = yes)
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rac.yang.com)
    )
  )

RAC1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.yang.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rac.yang.com)
      (INSTANCE_NAME = rac1)
    )
  )

RAC2 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.yang.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rac.yang.com)
      (INSTANCE_NAME = rac2)
    )
  )

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = server49.yang.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl.yang.com)
      (INSTANCE_NAME = orcl)
    )
  )

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