Cause
The specified value of MEMORY_TARGET was greater than MEMORY_MAX_TARGET.
The specified value of MEMORY_TARGET was greater than MEMORY_MAX_TARGET.
Set MEMORY_TARGET less than or equal to MEMORY_MAX_TARGET.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/4449010
https://community.oracle.com/message/3780586
https://community.oracle.com/message/4313492
https://community.oracle.com/message/2301687
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