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

答案:BCDhttp://www.cndba.cn/hbhe0316/article/108643http://www.cndba.cn/hbhe0316/article/108643http://www.cndba.cn/hbhe0316/article/108643http://www.cndba.cn/hbhe0316/article/108643http://www.cndba.cn/hbhe0316/article/108643

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