[FATAL] [DBT-11211] The Automatic Memory Management option is not allowed when the total physical memory is greater than 4G

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$ dbca -silent -createDatabase -responseFile /u01/dbatst1/18c/dbp1/assistants/dbca/dbca.rsp
[FATAL] [DBT-11211] The Automatic Memory Management option is not allowed when the total physical memory is greater than 4GB.
CAUSE: The current total physical memory is 7GB.

Its due to hard stop of not allowing Automatic Memory Management option if physical memory is greater than 4G .
Refer Oracle Doc ID 2244817.1 for more details.
Solution:
Use Automatic Shared Memory Management option instead Automatic Memory Management
If you are using DBCA to create the database untick "Enable Automatic Memory Management" options and proceed.

If you are using DBCA in silent mode include -automaticMemoryManagement FALSE

If you are using DBCA in silent with responseFile chnage automaticMemoryManagement=false in responseFile

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