ORA-00845 on Oracle 11g DB in a Virtual Machine (OVM)

If you run across this error when trying to start a database instance within a virtual machine, chances are that you may have reduced the allocated RAM to the VM. This is due to the automatic memory management module of Oracle DB 11g. One solution is the increase your memory allocation back.

ORA-00845: MEMORY_TARGET not supported on this system
Problem Description
While creating a startup database using dbca the database creation GUI gives error message in a pop up window,
ORA-00845: MEMORY_TARGET not supported on this system
from where you can ignore the error message.
The similar scenario also occur whenever you try to start your database then startup shows error message like below.

SQL> STARTUP
ORA-00845: MEMORY_TARGET not supported on this system

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