ORA-10873: file 1 needs to be either taken out of backup mode or media recovered

Scenario :

Database went down due to power fluctuation and during that time hot backup was running.So once we started the database we face the following issue.

Error:

ORA-10873: file 1 needs to be either taken out of backup mode or media recovered

Cause:

Database in backup mode while it went down.

Solution:

Step 1 : Sqlplus  ‘/as sysdba’
Step 2 : startup mount
Step 3 : Check backup file using below command.
            select * from V$BACKUP
Step 4 : The following command can be used to take all of the data files out of hot backup mode:
            ALTER DATABASE END BACKUP;
Step 5 : Alter database open