ORA-01113: file 9 needs media recovery解决

练习环境： LINUX（Centos8) +ORACL 12C2R

启动ORACLE 数据库，出现下面错误信息内容。

ORA-01113: file 9 needs media recovery解决

问题：

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 9 needs media recovery
ORA-01110: data file 9: '/u01/app/oracle/oradata/orcl/orclpdb/system01.dbf'

解决方法：

[oracle#ora12c ~]$ sqlplus sys/  as  sysdba  我的密码 

 SQL> RECOVER DATAFILE '/u01/app/oracle/oradata/orcl/orclpdb/system01.dbf'
Media recovery complete.
SQL> recover tablespace system;
Media recovery complete.
SQL> RECOVER DATABASE;
Media recovery complete.
SQL> ALTER DATABASE OPEN;
Database altered.