Kellyn Pot’vin-Gorman lays out some guidance on Oracle to Azure migrations:
When migrating an Oracle database to another platform, there are the common indicators and discussion topics around PL/SQL conversions, data types, application rewrites, etc., as being roadblocks to refactoring, but being successful also has to do with the SIZE of the workload coming from Oracle. I find this is often dismissed, even though this is one of the quickest ways to identify if an ENTIRE Oracle database, (not even by schema or a subset of the Oracle database) can run on a Platform as a Service, (PaaS) solution.
Click through for more information on PaaS limits for Oracle databases in Azure.