Cause
Attempted to shrink the SGA to the specified value but did not succeed because the SGA components could not be shrunk as they were already at their minimum sizes.
Attempted to shrink the SGA to the specified value but did not succeed because the SGA components could not be shrunk as they were already at their minimum sizes.
Do not set sga_target to a value below the current value without first shrinking the individual SGA components.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/3524203
https://community.oracle.com/message/3687257
https://community.oracle.com/message/2246522
https://community.oracle.com/message/3878097
https://community.oracle.com/message/2020151
Browse all solutions to database errors from Oracle, MS SQL, or MySQL