Cause
The specified value of MEMORY_TARGET was less than the sum of the specified values for SGA_TARGET and PGA_AGGREGATE_TARGET.
The specified value of MEMORY_TARGET was less than the sum of the specified values for SGA_TARGET and PGA_AGGREGATE_TARGET.
Set MEMORY_TARGET to at least the recommended value.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/10491301
https://community.oracle.com/message/10358317
https://community.oracle.com/message/9632334
https://community.oracle.com/message/10348116
https://community.oracle.com/message/11167250
https://community.oracle.com/message/9793162
https://community.oracle.com/message/11279965
https://community.oracle.com/message/11001162
https://community.oracle.com/message/10663916
https://community.oracle.com/message/9896270
https://community.oracle.com/message/11167256
https://community.oracle.com/message/9434153
https://community.oracle.com/message/10101417
https://community.oracle.com/message/4031728
https://community.oracle.com/message/4521591
Browse all solutions to database errors from Oracle, MS SQL, or MySQL