To accomplish user-managed backup for the USERS tablespace, you issued the following
command to put the database in backup mode:
SQL> ALTER TABLESPACE users BEGIN BACKUP;
While copying the file to the backup destination a power outage caused the instance to
terminate abnormally.
Which statement is true about the next database startup and the USERS tablespace?
A.
The database will open, and the tablespace automatically comes out of the backup mode.
B.
The database will be mounted, and recovery must be performed on the USERS
tablespace.
C.
The database will be mounted, and data files in the USERS tablespace must be taken out
of the backup mode.
D.
The database will not be mounted, and you must restore all the data files for the USERS
tablespace from the backup, and perform recovery.
C is correct:
https://docs.oracle.com/cd/B28359_01/backup.111/b28270/osbackup.htm
Ending a Backup After an Instance Failure or SHUTDOWN ABORT
The following situations can cause a tablespace backup to fail and be incomplete:
The backup completed, but you did not run the ALTER TABLESPACE … END BACKUP statement.
An instance failure or SHUTDOWN ABORT interrupted the backup.
Whenever crash recovery is required, if a datafile is in backup mode when an attempt is made to open it, then the database will not open the database until either a recovery command is issued, or the datafile is taken out of backup mode.
For example, the database may display a message such as the following at startup:
ORA-01113: file 12 needs media recovery
ORA-01110: data file 12: ‘/oracle/dbs/tbs_41.f’