I’m giving this advice to customers for many years:
When you create a fresh Oracle database ALWAYS create databases as CUSTOM databases. Via template or not doesn’t matter.
In the DBCA better use your own and wisely configured template rather than the prebuilt (we used to call them: seed) databases. The seed databases for “Data Warehouse” and “General Purpose or Transaction Processing” have all options and components included. I use them for testing from time to time.
As the upgrade duration mainly depends on the number of installed components I’d recommend to choose the components to install, and …
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