Oracle RAC 主备切换实验（主库双节点RAC到单节点备库）

本实验环境如下：
主库Oracle RAC双节点
node1 192.168.169.111
node2 192.168.169.222

备库为Oracle单节点
192.168.169.123

操作步骤

1、主库修改相关参数 fal_client、fal_server：

SQL> show parameter spfile;

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
spfile				     string	 +DATA/devdb/spfiledevdb.ora
SQL> show parameter fal

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
fal_client			     string
fal_server			     string
SQL> alter system set fal_client='devdb1' sid='devdb1';

System altered.

SQL> alter system set fal_client='devdb2' sid='devdb2';

System altered.

SQL> alter system set fal_server='phydb' sid='*';

System altered.

SQL> show parameter fal

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
fal_client			     string	 devdb1
fal_serv