oracle启动报错ORA-01157: cannot identify/lock data file 7 - see DBWR trace file ORA-01110: data file 7:

[oracle@localhost ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Apr 20 09:27:31 2017

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

Connected to an idle instance.

SQL> startup

ORACLE instance started.

Total System Global Area 2.6844E+10 bytes

Fixed Size    2069472 bytes

Variable Size 8925482016 bytes

Database Buffers 1.7901E+10 bytes

Redo Buffers   14704640 bytes

Database mounted.
ORA-01157: cannot identify/lock data file 7 - see DBWR trace file

ORA-01110: data file 7: '/oradata/test01.dbf

解决办法：

1）shutdown immediate;

2）startup mount

3）alter database datafile '/oradata/test.dbf' offline drop; 

4）关闭数据库

5）重新启动数据库，并执行如下语句:

drop tablespace test including contents cascade constraints;