ORA-29760: instance_number parameter not specified — without INSTANCE_NUMBER set

Oracle is complaining about:

ORA-29760: instance_number parameter not specified

And you have triple checked that the INSTANCE_NUMBER parameter is specified, but you still get the error.

The reason for that is, that your ORACLE_SID contains a underscore, e.g. ORA_SB. Starting with Oracle 12c the *underscore* parameter is a reserved character to indicate a server pool in a RAC.
Blase do not use the underscore parameter in the SID and the problem is gone.

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