Cause
An attempt was made to use more control files than Oracle supports.
An attempt was made to use more control files than Oracle supports.
Shut down Oracle. Reduce the number of control files specified in the CONTROL_FILES parameter in the initialization parameter file, and restart Oracle. Delete usused files.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/2314127
https://community.oracle.com/message/1365836
https://community.oracle.com/message/9915293
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