在10g以前，要徹底刪除數據庫，只有兩個方法，一個是利用DBCA圖形化工具刪除數據庫，另外一個就是關閉數據庫后，手工刪除數據文件、控制文件以及日志文件的方法。
從10g開始，Oracle提供了DROP DATABASE的語法，使得數據庫的刪除變得非常的簡單。
不過DROP DATABASE還是有一定的限制條件的：
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> alter database close;
Database altered.
SQL> drop database;
drop database
*
ERROR at line 1:
ORA-12719: operation requires database is in RESTRICTED mode
SQL> alter system enable restricted session;
System altered.
SQL> drop database;
Database dropped.
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> exit
[oracle@bjtest ~]$ ps -ef|grep test102
oracle 15805 14913 0 06:13 pts/1 00:00:00 grep test102
數據庫必須處于MOUNT狀態，且設置了RESTRICTED SESSION。執行了DROP DATABASE命令后，Oracle自動刪除控制文件，已經控制文件中記錄的數據文件和在線重做日志文件，如果數據庫使用了SPFILE，那么SPFILE文件也會刪除。這個命令不會刪除歸檔文件和備份文件。
在alert文件中，可以看到drop database對應的操作：
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
posted on 2011-11-02 15:24
孤飛燕 閱讀(2930)
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