052-201(新增70题2018)

Your database is in NOARCHIVELOG mode and a logswitch happens every 20 minutes. On Thursday morning, media failure resulted in corruption of a data file belonging to the TOOLS tablespace. Backups are taken on every Sunday.
What would you do in this situation?
A. recover using Oracle Flashback Database technology
B. restore the data files from backup and perform a complete recovery
C. restore only the corrupted data file and perform tablespace recovery
D. restore the data files from backup and perform cancel-based recovery
E. restore the entire database from the most recent backup and start the instance and open the database
Answer: E

media failure 
media recovery

The application of redo or incremental backups to a restored backup data file or individual data block.

When performing media recovery, you can recover a database, tablespace, data file, or set of blocks within a data file. Media recovery can be either complete recovery (in which all changes in the redo logs are applied) or incomplete recovery (in which only changes up to a specified point in time are applied). Media recovery is only possible when the database is in ARCHIVELOGmode.
所以只能用最近的冷备份进行恢复。