今天数据库在查询数据的时候显示了这个错误：

ORA-01157: cannot identify/lock data file 201 - see DBWR trace file

ORA-01110: data file 201: '/u01/app/oracle/oradata/ORA11GR2/temp01.dbf'

---查看临时表空间

SYS@GOOD> select FILE_NAME, TABLESPACE_NAME from dba_temp_files;

select FILE_NAME, TABLESPACE_NAME from dba_temp_files

                                       *

ERROR at line 1:

ORA-01157: cannot identify/lock data file 201 - see DBWR trace file

ORA-01110: data file 201: '/u01/app/oracle/oradata/ORA11GR2/temp01.dbf'

很明显这是我的临时表空间数据文件丢失了，导致不能查看数据文件

解决办法：

---删除文件

SYS@GOOD> alter database tempfile '/u01/app/oracle/oradata/ORA11GR2/temp01.dbf'drop;

Database altered.

---重建文件

SYS@GOOD> alter tablespace temp add tempfile'/u01/app/oracle/oradata/GOOD/temp01.dbf'size 100M;

Tablespace altered.

---验证文件

SYS@GOOD> select file_name,tablespace_name from dba_temp_files;

FILE_NAME                                       TABLESPACE_NAME

----------------------------------------------  -------

/u01/app/oracle/oradata/GOOD/temp01.dbf         TEMP