SQL*Plus: Release 10.2.0.1.0 - Production on Thu Aug 7 13:42:36 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> conn /as sysdba
Connected to an idle instance.
显示数据库已经连接不上；
此时可有两种方法来解决：
方法一：先禁用crs服务，后启用crs服务
（相当于从新启动系统，因为crs是随系统自动启动的），需要在两台节点上都执行；
具体步骤：
节点1：
1、[root@rac1 ~]# /etc/init.d/init.crs stop
Shutting down Oracle Cluster Ready Services (CRS):
Stopping resources.
Successfully stopped CRS resources
Stopping CSSD.
Shutting down CSS daemon.
Shutdown request successfully issued.
Shutdown has begun. The daemons should exit soon.
2、[root@rac1 ~]# su - oracle
[oracle@rac1 ~]$ crs_stat -t
CRS-0184: Cannot communicate with the CRS daemon.
3、[oracle@rac1 ~]$ exit
logout
[root@rac1 ~]# /etc/init.d/init.crs start
Startup will be queued to init within 90 seconds.
4、[root@rac1 ~]# su - oracle
[oracle@rac1 ~]$ crs_stat -t
Name Type Target State Host
------------------------------------------------------------
ora.ora9i.db application ONLINE ONLINE rac1
ora....i1.inst application ONLINE ONLINE rac1
ora....i2.inst application ONLINE ONLINE rac2
ora....SM1.asm application ONLINE ONLINE rac1
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....SM2.asm application ONLINE ONLINE rac2
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2
[oracle@rac1 ~]$
节点2：
1、[root@rac2 ~]# /etc/init.d/init.crs stop
Shutting down Oracle Cluster Ready Services (CRS):
Stopping resources.
Successfully stopped CRS resources
Stopping CSSD.
Shutting down CSS daemon.
Shutdown request successfully issued.
Shutdown has begun. The daemons should exit soon.
2、[root@rac2 ~]# su - oracle
[oracle@rac2 ~]$ crs_stat -t
CRS-0184: Cannot communicate with the CRS daemon.
[oracle@rac2 ~]$ exit
logout
3、[root@rac2 ~]# /etc/init.d/init.crs start
Startup will be queued to init within 90 seconds.
4、[root@rac2 ~]# su - oracle
[oracle@rac2 ~]$ crs_stat -t
Name Type Target State Host
------------------------------------------------------------
ora.ora9i.db application ONLINE ONLINE rac1
ora....i1.inst application ONLINE ONLINE rac1
ora....i2.inst application ONLINE ONLINE rac2
ora....SM1.asm application ONLINE ONLINE rac1
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....SM2.asm application ONLINE ONLINE rac2
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2
[oracle@rac2 ~]$
方法二：可以使用crs_stop -f先强制停止服务，在启动服务（在一台节点上运行即可）；
具体步骤：
[oracle@rac2 ~]$ crs_stop -f ora.rac1.ons
Attempting to stop `ora.rac1.ons` on member `rac1`
Stop of `