一、环境描述
周五要给客户讲11g OCP，提前做一个删除数据库测试，记录如下，知识点大家自己get吧~。工作和讲课真的是有很大区别，要对各种知识点知其然，还要知其所以然，理论要求高的多。加油！

二、具体操作
删除数据库主要有两种方法
1、使用DBCA
2、使用DROP DATABASE

下面使用第二种方法删除数据库，操作过程如下：

[root@11g-ocp ~]# su - oracle
<11g-ocp:orcl:/home/oracle>$export ORACLE_SID=orcl12345678
<11g-ocp:orcl12345678:/home/oracle>$sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Dec 11 18:36:28 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP and Real Application Testing options

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup restrict exclusive force mount;
ORACLE instance started.

Total System Global Area 1870647296 bytes
Fixed Size                  2254304 bytes
Variable Size             503319072 bytes
Database Buffers         1358954496 bytes
Redo Buffers                6119424 bytes
Database mounted.
SQL> drop database;

Database dropped.

Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP and Real Application Testing options
SQL>

大家可以考虑到底删除了哪些文件，还要哪些文件没有被删除，为什么要mount状态下删除呢？可以给我留言~