ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

I was trying to convert my noarchivelog database to archive log, I got below error.
My database was running so I started my database in mount stage using force mount and then tried alter database archivelog, it failed with error ORA-00265

SQL> startup force mount

ORACLE instance started.

Total System Global Area  805306368 bytes

Fixed Size                  1289996 bytes

Variable Size             218104052 bytes

Database Buffers          583008256 bytes

Redo Buffers                2904064 bytes

Database mounted.

SQL>

SQL> alter database archivelog;

alter database archivelog

*

ERROR at line 1:

ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

Now I tried to close database cleanly using shutdown immediate and opened in mount mode and fired command to convert to archivelog but unfortunately it failed again.

SQL> shut immediate

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

SQL>

SQL>

SQL> startup mount

ORACLE instance started.

Total System Global Area  805306368 bytes

Fixed Size                  1289996 bytes

Variable Size             218104052 bytes

Database Buffers          583008256 bytes

Redo Buffers                2904064 bytes

Database mounted.

SQL> alter database archivelog;

alter database archivelog

*

ERROR at line 1:

ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

Now this time I decided to cleanly shutdown the database and open the same with startup command, to open in OPEN mode

SQL> shut immediate

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

SQL>

SQL>

SQL> startup

ORACLE instance started.

Total System Global Area  805306368 bytes

Fixed Size                  1289996 bytes

Variable Size             218104052 bytes

Database Buffers          583008256 bytes

Redo Buffers                2904064 bytes

Database mounted.

Database opened.

SQL>

We can see database is open, now I bought database in mount stage as its requirement to convert database archive log from noarchivelog and then I fired command to convert database in archivelog mode and finally opened database using alter database command.

SQL> shut immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL>

SQL> startup mount

ORACLE instance started.

Total System Global Area  805306368 bytes

Fixed Size                  1289996 bytes

Variable Size             218104052 bytes

Database Buffers          583008256 bytes

Redo Buffers                2904064 bytes

Database mounted.

SQL>

SQL> alter database archivelog;

Database altered.

SQL>

SQL> alter database open;

Database altered.

SQL>

SQL> archive log list;

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     35

Next log sequence to archive   36

Current log sequence           36

SQL>

So the Solution to error ORA-00265 is cleanly shutdown the database and open it in open mode and bring it in mount state normally and fire alter database archivelog.

[Also read : Switching between ARCHIVELOG Mode and NOARCHIVELOG.]