oracle中怎么彻底删除数据文件，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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物理删除数据文件：
alter database datafile 8 offline drop;
alter database datafile 9 offline drop;
select file#,status$ from file$;
FILE# STATUS$
---------- ----------
1 2
2 2
3 2
4 2
5 2
6 1
7 2
8 2
9 2
10 1
11 1
12 1
13 1
14 1
15 1
16 1
17 1
18 1
19 1
20 1
21 1
22 1
23 1
24 1
SYS@hhw1> delete file$ where FILE#=8;
1 row deleted.
SYS@hhw1> delete file$ where FILE#=9;
1 row deleted.
SYS@hhw1> commit;
Commit complete.
SYS@hhw1> select file_id,file_name,tablespace_name from dba_data_files;
FILE_ID FILE_NAME TABLESPACE_NAME
---------- ------------------------------------------------------------ --------------------
1 +DATA/hhw/datafile/system.256.938483503 SYSTEM
2 +DATA/hhw/datafile/sysaux.257.938483503 SYSAUX
3 +DATA/hhw/datafile/undotbs1.258.938483503 UNDOTBS1
4 +DATA/hhw/datafile/users.259.938483505 USERS
5 +DATA/hhw/datafile/undotbs2.264.938483663 UNDOTBS2
此时数据字典中的信息已删除，但控制文件仍留有记录，需要重建控制
alter database backup controlfile to trace as '/home/oracle/a.txt';
SYS@hhw1> select file#,name from v$datafile;
FILE# NAME
---------- ------------------------------------------------------------
1 +DATA/hhw/datafile/system.256.938483503
2 +DATA/hhw/datafile/sysaux.257.938483503
3 +DATA/hhw/datafile/undotbs1.258.938483503
4 +DATA/hhw/datafile/users.259.938483505
5 +DATA/hhw/datafile/undotbs2.264.938483663
8 +DATA/hhw/datafile/users.291.970554721 -----仍存在
9 +DATA/hhw/datafile/users.291.963587193 -----仍存在
alter system set cluster_database=false scope=spfile;
shutdown immediate
startup nomount
控制文件需要修改，去掉offline drop的数据文件：
CREATE CONTROLFILE REUSE DATABASE "HHW" NORESETLOGS FORCE LOGGING ARCHIVELOG
MAXLOGFILES 192
MAXLOGMEMBERS 3
MAXDATAFILES 1024
MAXINSTANCES 32
MAXLOGHISTORY 292
LOGFILE
GROUP 1 '+DATA/hhw/onlinelog/group_1.261.938483583' SIZE 50M BLOCKSIZE 512,
GROUP 2 '+DATA/hhw/onlinelog/group_2.262.938483583' SIZE 50M BLOCKSIZE 512,
GROUP 3 '+DATA/hhw/onlinelog/group_3.265.938483763' SIZE 50M BLOCKSIZE 512,
GROUP 4 '+DATA/hhw/onlinelog/group_4.266.938483763' SIZE 50M BLOCKSIZE 512
-- STANDBY LOGFILE
DATAFILE
'+DATA/hhw/datafile/system.256.938483503',
'+DATA/hhw/datafile/sysaux.257.938483503',
'+DATA/hhw/datafile/undotbs1.258.938483503',
'+DATA/hhw/datafile/users.259.938483505',
'+DATA/hhw/datafile/undotbs2.264.938483663',
'+DATA/hhw/datafile/users.267.940497227'
CHARACTER SET ZHS16GBK;
alter database open;
alter system set cluster_database=true scope=spfile;
shutdown immediate
srvctl start database -d hhw
SYS@hhw1> select file_id,file_name,tablespace_name from dba_data_files;
FILE_ID FILE_NAME TABLESPACE_NAME
---------- ------------------------------------------------------------ ------------------------------
1 +DATA/hhw/datafile/system.256.938483503 SYSTEM
2 +DATA/hhw/datafile/sysaux.257.938483503 SYSAUX
3 +DATA/hhw/datafile/undotbs1.258.938483503 UNDOTBS1
4 +DATA/hhw/datafile/users.259.938483505 USERS
5 +DATA/hhw/datafile/undotbs2.264.938483663 UNDOTBS2
SYS@hhw1> select file#,name from v$datafile;
FILE# NAME
---------- ------------------------------------------------------------
1 +DATA/hhw/datafile/system.256.938483503
2 +DATA/hhw/datafile/sysaux.257.938483503
3 +DATA/hhw/datafile/undotbs1.258.938483503
4 +DATA/hhw/datafile/users.259.938483505
5 +DATA/hhw/datafile/undotbs2.264.938483663
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