Solution to ORA-00205 errors

In order to configure database recoverability, I tried to modify the control file, alter system set control_files = '/u01/app/Oracle/oradata/$ ORACLE_SID/controlfile/o1_mf_7p5b2xty _. ctl ','/u01/app/oracle/flash_recovery_area/$ ORACLE_SID/controlfile/o1_mf_7p5b2y0c _. ctl 'scope = spfile;

The execution result is: the system has been changed.

Then restart the database.

However, an error is reported when the database is shut down,

ORA-01507 :........

Then start the database, it cannot start, report ORA-00205.

I found the control file on the Internet, and read the alter log bottom error at/u01/app/oracle/admin/$ ORACLE_SID/bdump, cannot be found

'/U01/app/oracle/oradata/$ ORACLE_SID/controlfile/o1_mf_7p5b2xty _. ctl' file or directory,

I thought it was a path problem. Then I copied the file into a copy and changed the name.

Then execute: startup nomount to enter the path of the modification control file,

Alter system set

Control_files = '/u01/app/oracle/oradata/$ ORACLE_SID/controlfile/control01.ctl ',

'/U01/app/oracle/oradata/$ ORACLE_SID/controlfile/control02.ctl ',

'/U01/app/oracle/oradata/$ ORACLE_SID/controlfile/control03.ctl' scope = spfile;

These three control files are copied based on the above two files, and then changed the name.

Run shutdown immediate.

Start the database again, and then OK.