1、数据库打开报错如下：
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
ORA-01110: data file 4: '/weblogic/oradata/orcl/users01.dbf'
2、查看告警日志，同样报错：
Thu Nov 10 17:58:14 2016
alter database open
Thu Nov 10 17:58:14 2016
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_dbw0_22383.trc:
ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
ORA-01110: data file 4: '/weblogic/oradata/orcl/users01.dbf'
ORA-27041: unable to open file
Linux-x86_64 Error: 13: Permission denied
Additional information: 9
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_dbw0_22383.trc:
ORA-01157: cannot identify/lock data file 5 - see DBWR trace file
ORA-01110: data file 5: '/weblogic/oradata/orcl/users02.dbf'
ORA-27041: unable to open file
Linux-x86_64 Error: 13: Permission denied
Additional information: 9
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_24033.trc:
ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
ORA-01110: data file 4: '/weblogic/oradata/orcl/users01.dbf'
ORA-1157 signalled during: alter database open...
3、因为报错linux错误，所以查看具体的数据文件权限，发现数据文件权限都变成了weblogic：
[root@slave1 weblogic]# ll
total 24
drwx------. 2 weblogic weblogic 16384 May 6 2016 lost+found
drwxrwxr-x. 3 weblogic weblogic 4096 May 6 2016 Oracle
drwxr-xr-x. 3weblogic weblogic 4096 Aug 16 10:20 oradata
4、修改数据文件权限：
[root@slave1 weblogic]# chown -R oracle:oinstall Oracle/
[root@slave1 weblogic]# chown -R oracle:oinstall oradata/
[root@slave1 weblogic]# ll
total 24
drwx------. 2 weblogic weblogic 16384 May 6 2016 lost+found
drwxrwxr-x. 3 oracle oinstall 4096 May 6 2016 Oracle
drwxr-xr-x. 3 oracle oinstall 4096 Aug 16 10:20 oradata
5、成功打开数据库，告警日志也没有再次报错：
SQL> alter database open;
Database altered.