1、登录数据库：执行alter system set cluster_database = false scope=spfile;

2、关闭node1和node2数据库：shutdown immediate;

3、启动node1至mount状态：startup mount;

4、执行关闭归档：alter database noarchivelog;

5、开启数据库：alter database open;

6、在node1执行：alter system set cluster_database=true scope=spfile;

7、关闭数据库：shutdown immediate;

8、启动node1数据库：startup

9、启动node2数据库：startup