今天登陆到数据库做了一个小测试后 忘记了用命令删除表空间，直接在Linux下删掉了数据文件，

结果，悲剧就开始了。(弄明白了整理出来大家共同study)

实验环境：

[oracle@tyger ~]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 4.6 (Tikanga)
[oracle@tyger ~]$ . .bash_profile
[oracle@tyger ~]$ sqlplus / as sysdba


SQL*Plus: Release 10.2.0.1.0 - Production on Sat Mar 1 15:54:53 2014


Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options


SYS@ORCL>select status from v$instance;


STATUS
------------
OPEN


SYS@ORCL>select * from v$version;


BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

查看一下当前数据库中的数据文件有哪些

用到 数据字典 （dba_data_files dba_tablespaces ) 和 v$datafile

SYS@ORCL>select tablespace_name,file_name from dba_data_files;


TABLESPACE_NAME
------------------------------
FILE_NAME
--------------------------------------------------------------------------------
USERS
/u01/app/oracle/oradata/ORCL/users01.dbf


SYSAUX
/u01/app/oracle/oradata/ORCL/sysaux01.dbf


UNDOTBS1
/u01/app/oracle/oradata/ORCL/undotbs01.dbf

TABLESPACE_NAME
------------------------------
FILE_NAME
--------------------------------------------------------------------------------
SYSTEM
/u01/app/oracle/oradata/ORCL/system01.dbf


EXAMPLE
/u01/app/oracle/oradata/ORCL/example01.dbf


SYS@ORCL>col file_name for a50
SYS@ORCL>col tablespace_name for a10
SYS@ORCL>/


TABLESPACE FILE_NAME
---------- --------------------------------------------------
USERS /u01/app/oracle/oradata/ORCL/users01.dbf
SYSAUX /u01/app/oracle/oradata/ORCL/sysaux01.dbf
UNDOTBS1 /u01/app/oracle/oradata/ORCL/undotbs01.dbf
SYSTEM /u01/app/oracle/oradata/ORCL/system01.dbf
EXAMPLE /u01/app/oracle/oradata/ORCL/example01.dbf


SYS@ORCL>select tablespace_name,status,contents from dba_tablespaces;


TABLESPACE STATUS CONTENTS
---------- --------- ---------
SYSTEM ONLINE PERMANENT
UNDOTBS1 ONLINE UNDO
SYSAUX ONLINE PERMANENT
TEMP ONLINE TEMPORARY
USERS ONLINE PERMANENT
EXAMPLE ONLINE PERMANENT


6 rows selected.


SYS@ORCL>select file#,ts#,name from v$datafile;


FILE# TS#
---------- ----------
NAME
--------------------------------------------------------------------------------
1 0
/u01/app/oracle/oradata/ORCL/system01.dbf


2 1
/u01/app/oracle/oradata/ORCL/undotbs01.dbf


3 2
/u01/app/oracle/oradata/ORCL/sysaux01.dbf




FILE# TS#
---------- ----------
NAME
--------------------------------------------------------------------------------
4 4
/u01/app/oracle/oradata/ORCL/users01.dbf


5 6
/u01/app/oracle/oradata/ORCL/example01.dbf




SYS@ORCL>col name for a50
SYS@ORCL>l
1* select file#,ts#,name from v$datafile
SYS@ORCL>/


FILE# TS# NAME
---------- ---------- --------------------------------------------------
1 0 /u01/app/oracle/oradata/ORCL/system01.dbf
2 1 /u01/app/oracle/oradata/ORCL/undotbs01.dbf
3 2 /u01/app/oracle/oradata/ORCL/sysaux01.dbf
4 4 /u01/app/oracle/oradata/ORCL/users01.dbf
5 6 /u01/app/oracle/oradata/ORCL/example01.dbf