参考文档：

How to remove/delete a node from Grid Infrastructure Clusterware when the node has failed (文档 ID 1262925.1)

删除数据库实例：

可以使用dbca图形界面删除

也可以使用dbca静默方式删除rac1中的数据库实例：

[oracle@rac2 bin]$ dbca -silent -deleteInstance -nodeList rac1 -gdbName orcl -instanceName orcl1 -sysDBAUserName sys -sysDBAPassword oracle

Deleting instance

1% complete

2% complete

6% complete

13% complete

20% complete

26% complete

33% complete

40% complete

46% complete

53% complete

60% complete

66% complete

Completing instance management.

100% complete

更新RAC节点信息：

[oracle@rac2 bin]$ echo $ORACLE_HOME

/oracle/app/oracle/product/11.2.0/db_1/oui/bin/

[oracle@hisrac02 bin]$  ./runInstaller -updateNodeList ORACLE_HOME=/oracle/app/oracle/product/11.2.0/db_1 "CLUSTER_NODES=hisrac02" 

Starting Oracle Universal Installer...

Checking swap space: must be greater than 500 MB.   Actual 62924 MB    Passed

The inventory pointer is located at /etc/oraInst.loc

The inventory is located at /oracle/app/oraInventory

查看集群节点信息：

[root@hisrac02 bin]#  ./crsctl stat res -t |grep vip

ora.hisrac02.vip

ora.scan1.vip

删除rac1节点的vip：

[root@hisrac02 bin]# ./srvctl remove vip -i rac1 -f

查看集群节点信息：

[root@hisrac02 bin]# ./olsnodes -s -t

hisrac01        Inactive        Unpinned

hisrac02        Active  Unpinned

从集群中删除节点1：

[root@hisrac2 bin]# ./crsctl delete node -n hisrac01

CRS-4661: Node rac1 successfully deleted.

更新集群节点信息：

[grid@hisrac02 bin]$  ./runInstaller -updateNodeList ORACLE_HOME=/oracle/app/oracle/product/11.2.0/db_1 "CLUSTER_NODES=hisrac02" 

Starting Oracle Universal Installer...

Checking swap space: must be greater than 500 MB.   Actual 62929 MB    Passed

The inventory pointer is located at /etc/oraInst.loc

The inventory is located at /oracle/app/oraInventory

'UpdateNodeList' was successful.

检查确认仅剩余hisrac02节点：

[grid@hisrac02 bin]$ olsnodes

hisrac02

至此，从集群中清理hisrac01信息完毕。