Thank you Yasuyuki for the prompt reply.
In our case, we are looking to install DevTest 10.1 in an RHEL 7.2 machine. We would also want to migrate the database used by an existing DevTest 8.4 installation. Reading the upgrade guide gave me the impression that an in-place upgrade was recommended, i.e., upgrading on top of an existing installation. So do you think we should manually insert the data from the DevTest 8.4 database to the DevTest 10.1 database?