Cause
An instance tried to start by using a value of the initialization parameter INSTANCE_NUMBER that is already in use.
An instance tried to start by using a value of the initialization parameter INSTANCE_NUMBER that is already in use.
Either a) specify another INSTANCE_NUMBER, b) shut down the running instance with this number c) wait for instance recovery to complete on the instance with this number.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/9467838
https://community.oracle.com/message/3569043
https://community.oracle.com/message/11284241
https://community.oracle.com/message/11159668
https://community.oracle.com/message/10308438
https://community.oracle.com/message/9874263
https://community.oracle.com/message/10229400
https://community.oracle.com/message/10370456
https://community.oracle.com/message/10889120
https://community.oracle.com/message/10554765
https://community.oracle.com/message/3427404
https://community.oracle.com/message/10961255
https://community.oracle.com/message/9203021
https://community.oracle.com/message/3599586
https://community.oracle.com/message/2173450
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