How do I open a database after an online hot backup fails?

Backup | Hot Backup | data | How do I open a database after a failed online hot backup?
System environment: 1, operating system: Windows 2000
2. Database: Oracle 8i R2 (8.1.6) for NT Enterprise Edition
3, Installation path: C:\ORACLE
Error phenomenon: When online hot backup, the server has failed, such as power off, restart the server,
The database cannot be opened when the database is started, and Oracle requires media recovery.
Because the table space is still in hot backup state.
Simulation Phenomena and Solutions:
First set the database to archive mode c:\>svrmgrlsvrmgrl>connect internalsvrmgrl>alter tablespace table space name begin backup;-- The table space hot standby mode forcibly shuts down the database, causing an error svrmgrl>shutdown Abortsvrmgrl>startup mount--The data file for this tablespace into end backup mode when the database is not open SVRMGRL >alter database datafile ' table space data file name ' End backup;--or execute tablespace media restore svrmgrl>recover tablespace table space name; svrmgrl>alter Database open;