A sudden power outage when hot backup

Alter TABLESPACE users begin backup;

Power

Startup

Select status from V$instance;

Alter TABLESPACE users end backup;

ALTER DATABASE open;

-----------------------------------------------------

[Email protected]>alter tablespace users begin backup;

Tablespace altered.

[Email Protected]>shutdown abort

ORACLE instance shut down.

[Email Protected]>startup

ORACLE instance started.

Total System Global area 830930944 bytes

Fixed Size 2231048 bytes

Variable Size 616563960 bytes

Database buffers 205520896 bytes

Redo buffers 6615040 bytes

Database mounted.

Ora-10873:file 4 needs to being either taken out of backup mode or media

Recovered

Ora-01110:data file 4: ' +data/ora11g/datafile/users.259.833721555 '

[Email protected]>select status from V$instance;

STATUS

----------

Mounted

[Email protected]>alter tablespace users end backup;

Tablespace altered.

[Email protected]>alter database open;

Database altered.

A sudden power outage when hot backup