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

Error description:

SQL> alter database archivelog;
alter database archivelog
*
ERROR at line 1:
ORA-00265: instance recovery required, cannot set ARCHIVELOG mode

Cause:
The database was crashed itself or you issued shutdown abort or startup force commands.
In my case I issued the following command, to take database into mount state.

SQL> startup mount force;

Solution:

SQL> select status from v$instance;
STATUS
————————————
MOUNTED
SQL> alter database open;
Database altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 293601280 bytes
Fixed Size 1248600 bytes
Variable Size 88081064 bytes
Database Buffers 197132288 bytes
Redo Buffers 7139328 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.