1. In which two situations can you use Database Upgrade Assistant（）?
   A、when the operating system(OS)needs to be changed as part of the upgrade
   B、when multiple pluggable databases in a container database have to be upgraded in a specific sequence
   C、when the hardware platform needs to be changed as part of the upgrade
   D、when a character set conversion is required during the upgrade
   E、when the target and source database are on the same platform .
   答案：B、E
   ACD属于迁移

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