和学操作系统一样，安装完rac集群后，第一件事就是就是要学习如何启动和关闭，启动和关闭rac一般使用三种方式:sqlplus,srvctl以及
[oracle@rac2 ~]$ srvctl start nodeapps -n rac1
[oracle@rac2 ~]$ srvctl start nodeapps -n rac2
[oracle@rac2 ~]$ srvctl start asm -n rac1
[oracle@rac2 ~]$ srvctl start asm -n rac2
[oracle@rac2 ~]$ srvctl start instance -d racdb -i racdb1 -o mount
[oracle@rac2 ~]$ srvctl start instance -d racdb -i racdb2 -o open
sql*plus: release 10.2.0.1.0 - production on sat nov 26 12:15:57 2011
copyright (c) 1982, 2005, oracle.  all rights reserved.
connected to:
oracle database 10g enterprise edition release 10.2.0.1.0 - 64bit production
with the partitioning, real application clusters, olap and data mining options
sql> select open_mode,name  from v$database;
open_mode                      name
------------------------------ ---------------------------
mounted                        racdb
open_mode                      name
------------------------------ ---------------------------
read write                     racdb
，