rac  drop database
1--删除数据库实例 (删除实例前先关闭实例）

srvctl stop instance -d afclc -i afclc1

srvctl remove instance -d afclc -i afclc1

srvctl stop instance -d afclc -i afclc2

srvctl remove instance -d afclc -i afclc2

2--删除数据库

srvctl stop database -d afclc

srvctl remove database -d afclc
3.先停止所有节点实例(否则回报ORA-29707: inconsistent value 1 for initialization parameter cluster_database_instances with other instances）
sqlplus "/as sysdba"
shutdown immediate 
4.在其中一节点操作，先关闭rac模式。
startup nomount
alter system set CLUSTER_DATABASE=FALSE scope=spfile;
shutdown immediate
3启动mount restric 模式
startup mount restrict 
4.删除数据库
drop database;
 
 
 
 
 
说明：
1，10g以上才能有drop database命令
2，The DROP DATABASE command deletes these files from operating system.
* Datafiles  www.2cto.com  
* Online Redo Log Files
* Controlfiles
* SPFILE (if it exists)
 
The DROP DATABASE command does not delete the following files:
* init.ora (text version of the   initialization file)
* password file
* entries in listener files
* entries in oratab file
3,win NT环境下文件不会自动删除