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12cR2 DBCA, Automatic Memory Management, and -databaseType

This post explains the following error encountered when creating a 12.2 database with DBCA:
[DBT-11211] The Automatic Memory Management option is not allowed when the total physical memory is greater than 4GB.
or when creating the database directly with the installer:
[INS-35178]The Automatic Memory Management option is not allowed when the total physical memory is greater than 4GB.
If you used Automatic Memory Management (AMM) you will have to think differently and size the SGA and PGA separately.