1z0-063 Exam - Question 180

For a database running in NOARCHIVELOG mode, backups can be performed under certain conditions. A consistent whole database backup can be done when the database is shut down cleanly, ensuring that all changes are written to disk, making option A correct. It's possible to back up noncritical tablespaces without shutting down the instance, as these are not critical to the core operation of the database, making option B correct. Backup of only those blocks that have changed since the last backup while the database is mounted can also be performed, which is option D. Option C is incorrect because in NOARCHIVELOG mode, the database needs to be shut down, and option E is incorrect because only the used blocks in critical tablespaces cannot be backed up while the database is open.