ORA-01102: cannot mount database in EXCLUSIVE mode

现象：节点2启动实例失败，如下报错

SQL> startup
ORA-01102: cannot mount database in EXCLUSIVE mode

日志信息

Starting ORACLE instance (normal)
....
....
Fri Aug 23 18:09:31 2013
MARK started with pid=44, OS id=19025 
NOTE: MARK has subscribed 
USER (ospid: 18692): terminating the instance due to error 1102
Instance terminated by USER, pid = 18692

原因：集群参数问题

处理办法，重启两个节点

SQL>  alter system set cluster_database=TRUE scope=spfile sid='*';

System altered.

SQL>  alter system set cluster_database_instances=2 scope=spfile sid='*';

System altered.

SQL>