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InitSID.ora processes for cluster servers

How do I calculate the processes in my initSID.ora for three cluster servers? What should be the criteria for the sessions, as well?

How do I calculate the processes in my initSID.ora for three cluster servers? What should be the criteria for the sessions, as well?
Rather than attempt to calculate your processes parameter value down to an exact figure, I would suggest using some rough guesswork on the number of total processes per instance you expect, at least double it, and then monitor your v$ views to adjust it if necessary. This is not extremely memory-intensive and I typically see numbers in my MAX_UTILIZATION of 1/3 my INITIAL_ALLOCATION in my v$resource_limit view. In other words, approach it for each instance in the same way as you would if the instance was the sole instance for the database. You are not required to set this uniformly across nodes.

The value for sessions is derived from processes (*1.1 + 5, or something like that?) and although Oracle documentation advises that this may need to be adjusted if you manually adjust the processes parameter, I don't believe I have ever supported a system where I have had to do this, RAC or not. Unless your system has a particular quirk that requires you to visit this parameter specifically, I would leave it set to the value derived from the processes setting.

I hope this helps,
Bill

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