Choose three. Which three are true about using Database Upgrade
Assistant (DBUA) to upgrade a database?
A.DBUA must be launched from the target Oracle Home. B.Multiple databases with the same ORACLE_HOME can be upgraded正确答案ADE
Simultaneously. C.A whole database backup must exist before upgrade. D.The Pre-Upgrade Information Tool script is executed by DBUA. E.All pluggable databases are automatically upgraded as part of a container
Database upgrade. F.The database must be opened in read-only mode.
