Is it possible to perform a final migration of a productive system without a “test” run?
No, you should never do this. You should perform a test migration on a comparable hardware with a system which is a copy of the productive database. This is necessary both to get an idea of the overall runtime of the productive migration an to recognize major issues at the export/import before the final migration. The same applies for the migration key. That means the migration key is generated as a self-service and should be tested before the productive migration. In case of any issues with the key generated it’s not possible to create migration keys by the weekend support.
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