今天一同事找我，说他本地的数据库被他误删除了文件，导致不能打开，然给看看。
SQL> conn jjw/jjw
ERROR:
ORA-01033: Oracle initialization or shutdown in progress

Warning: You are no longer connected to ORACLE.
SQL>
数据库已经启动，但连接报错。如是，我重启一下，看报什么错误。
SQL> conn /as sysdba
Connected.
SQL> shutdown immediate
ORA-01109: database not open

Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 1224736768 bytes
Fixed Size                  2020384 bytes
Variable Size             218106848 bytes
Database Buffers          989855744 bytes
Redo Buffers               14753792 bytes
Database mounted.
ORA-01122: database file 10 failed verification check
ORA-01110: data file 10: '/oracle/database/tabjj_tab.dbf'
ORA-01251: Unknown File Header Version read for file number 10

SQL>
首先，得从数据库中删除这个有问题的文件。
SQL> startup mount
ORACLE instance started.
Total System Global Area 1224736768 bytes
Fixed Size                  2020384 bytes
Variable Size             218106848 bytes
Database Buffers          989855744 bytes
Redo Buffers               14753792 bytes
Database mounted.
SQL> alter database datafile  '/oracle/database/tabjj_tab.dbf' offline drop;
Database altered.
 
SQL> alter database open;
Database altered.
SQL>
数据库恢复正常。
 
以上只是测试环境下的操作，正式系统上，千万不能这样随意删除文件了。

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