1、确定要删除的数据库
SQL> show parameter instance_name;

NAME TYPE VALUE

instance_name string THCZY
2、一致性关闭数据库
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
3、启动数据库到限制排它模式
SQL> startup restrict exclusive force mount;
ORACLE instance started.

Total System Global Area 8752005120 bytes
Fixed Size 2253456 bytes
Variable Size 1979714928 bytes
Database Buffers 6744440832 bytes
Redo Buffers 25595904 bytes
Database mounted.
SQL> show parameter instance_name;

NAME TYPE VALUE

instance_name string THCZY

4、删除收据库
SQL> drop database;