ORA-1113 when open database

Issue:
alter database open
ORA-1113 signalled during: alter database open...
Starting ORACLE instance (normal)
Solution:
startup mount
ALTER DATABASE RECOVER  database;
or
Check backup mode
        -- Hot backup status
        SELECT  COUNT(*) FROM v$backup WHERE status ='ACTIVE';
        -- Tablespaces in hot backup mode
        SELECT  distinct ddf.tablespace_name tablespace_name
        FROM    v$backup vb, DBA_DATA_FILES ddf
        WHERE   vb.status ='ACTIVE' and vb.file#  = ddf.file_id;
ALTER TABLESPACE (<tbs_name from the query before>) END BACKUP ;