Oracle 10g新增DROP DATABASE命令
在10g以前，要彻底删除数据库，只有两个方法，一个是利用DBCA图形化工具删除数据库，另外一个就是关闭数据库后，手工删除数据文件、控制文件以及日志文件的方法。从10g开始，Oracle提供了DROP DATABASE的语法，使得数据库的删除变得非常的简单。
不过DROP DATABASE还是有一定的限制条件的：
SQL> conn / as sysdba
Connected.
SQL> drop database;
drop database
*
ERROR at line 1:
ORA-01586: database must be mounted EXCLUSIVE and not open for this operation
SQL>>
Database> SQL> drop database;
drop database
*
ERROR at line 1:
ORA-12719: operation requires database is in RESTRICTED mode
SQL>>
System> SQL> drop database;
Database dropped.
Disconnected from Oracle Database 10g Enterprise Edition> With the Partitioning, OLAP and Data Mining options
SQL> exit
$ ps -ef|grep test102
oracle 15805 14913 0 06:13 pts/1 00:00:00 grep test102
数据库必须处于MOUNT状态，且设置了RESTRICTED SESSION。执行了DROP DATABASE命令后，Oracle自动删除控制文件，已经控制文件中记录的数据文件和在线重做日志文件，如果数据库使用了SPFILE，那么SPFILE文件也会删除。这个命令不会删除归档文件和备份文件。
在alert文件中，可以看到drop database对应的操作：
drop database
Mon May 18 06:13:01 2009
Deleted file /data/oradata/test102/system01.dbf
Deleted file /data/oradata/test102/undotbs1.dbf
Deleted file /data/oradata/test102/sysaux01.dbf
Deleted file /data/oradata/test102/redo01.log
Deleted file /data/oradata/test102/redo02.log
Deleted file /data/oradata/test102/redo03.log
Deleted file /data/oradata/test102/redo04.log
Deleted file /data/oradata/test102/redo05.log
Deleted file /data/oradata/test102/redo06.log
Deleted file /data/oradata/test102/redo07.log
Deleted file /data/oradata/test102/temp01.dbf
Instance terminated by USER, pid = 15795
Deleted file /data/oradata/test102/control01.ctl
Completed: drop database
Mon May 18 06:13:08 2009
Shutting down instance (abort)
License high water mark = 1
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