問題：
SQL> startup
ORACLE instance started.
Total System Global Area 1610612736 bytes
Fixed Size 779080 bytes
Variable Size 535043256 bytes
Database Buffers 1073741824 bytes
Redo Buffers 1048576 bytes
Database mounted.
ORA-01113: file 1 needs media recovery
ORA-01110: data file 1: '/oracle/app/oradata/phoneclient/system01.dbf'
解決方法：
SQL> RECOVER DATAFILE '/oracle/app/oradata/phoneclient/system01.dbf '
Media recovery complete.
SQL> recover tablespace system;
Media recovery complete.
SQL> RECOVER DATABASE;
Media recovery complete.
SQL> ALTER DATABASE OPEN;
Database altered.