Oracle Database Administration from Zero to Hero - Managing Undo Data (Part 3 of 3)

The video tutorial covers Oracle Database's undo management, focusing on undo extents, retention guarantee, and temporary undo features. It explains the importance of undo retention and how to enable retention guarantee to prevent overwriting unexpired undo. The tutorial also introduces the temporary undo feature, which optimizes undo management for temporary tables by reducing undo storage and redo log size. Additionally, it discusses shared and local undo modes in multi-tenant environments, highlighting the benefits of local undo mode for efficiency and certain operations. The lecture concludes with a summary and learning objectives.

What happens when the database is under stress and cannot allocate more active undo extents?

• The database shuts down.

• The database overwrites old undo.

• The database creates new undo tablespace.

• The database stops all transactions.

What is the purpose of enabling Retention Guarantee in an undo tablespace?

• To allow more users to access the database.

• To increase database speed.

• To reduce the size of the database.

• To ensure no unexpired undo is overwritten.

What is the default state of the Temporary UNDO feature in Oracle Database?

• Enabled only for admin users

• Partially enabled

• Disabled

• Enabled

How does the Temporary UNDO feature benefit the database?

• Increases the number of transactions.

• Improves the security of the database.

• Allows more users to connect simultaneously.

• Reduces the amount of undo stored and redo logs generated.

In a multi-tenant environment, what is the main difference between shared and local undo modes?

• Shared mode uses a single undo tablespace for all containers.

• Local mode requires more memory.

• Shared mode is faster than local mode.

• Local mode is only available in Oracle 11g.

What must be done to change the undo mode of an existing CDB?

• Restart the instance after changing the mode.

• Reinstall the database.

• Change the mode only during off-peak hours.

• Change the mode and continue without restart.

Which undo mode is preferred for Oracle databases in a multi-tenant environment?

• Dynamic mode

• Hybrid mode

• Local mode

• Shared mode

What is a key benefit of using local undo mode in Oracle databases?

• It allows for faster data entry.

• It enhances user interface design.

• It increases the efficiency of unplugging PDBs.

• It reduces the need for backups.

What is the main focus of the lecture summary?

• Undo benefits and space management tasks.

• User interface improvements.

• Database security features.

• Network configuration settings.

Which of the following is NOT a task mentioned in the lecture summary?

• Describe undo benefits.

• Use the undo advisor.

• Set the undo management parameters.

• Enable database encryption.