Oracle Database Administration from Zero to Hero - Introducing RESTORE and RECOVER Commands

This lecture covers the concepts of database recovery, focusing on the differences between critical and non-critical data loss, and the actions performed by the RMAN restore and recover commands. It explains the types of failures that can occur, such as physical and logical failures, and the causes of data loss, including human error and media failure. The lecture also details the steps to prepare for a recovery procedure and the use of RMAN commands for complete and incomplete recovery.

What is the primary focus of this lecture?

• Database design principles

• Data loss prevention strategies

• Recovery procedures and commands

• Database performance tuning

Which of the following is a logical failure?

• Disk corruption

• Power outage

• Application logic error

• Hardware malfunction

What is a non-critical database file?

• Index tablespace

• System tablespace data file

• Online redo log

• Control file

What happens if a critical database file is lost?

• The database continues to operate normally

• The database crashes

• The database slows down

• The database becomes read-only

What does the RMAN restore command do?

• Creates a data file from a backup

• Generates a new backup

• Deletes old backup files

• Applies changes to data files

What is the purpose of the RMAN recover command?

• To shut down the database

• To create a backup

• To apply changes to restored data files

• To delete corrupted files

What is complete recovery in RMAN?

• Recovering only critical files

• Applying all changes up to the failure point

• Skipping non-essential files

• Restoring data files to their original state

When can the restore command be used?

• When the database is started, mounted, or open

• When the database is in no archive log mode

• When the database is open and online

• When the database is shut down

What is a necessary step before performing recovery?

• Identifying the lost data files

• Deleting old backups

• Changing the database password

• Shutting down the database

What is the role of archived redo logs in recovery?

• They are deleted after recovery

• They are not used in recovery

• They are used to create new backups

• They are used to apply changes to data files