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I can think of two possibilities for how this is working:
- You are choosing to adjust the number of threads supported by the first physical processor. In this case, if you change this from 20 to 16, you should then have 36 running threads.
- You are choosing to adjust the number of threads supported by each physical processor. In this case, if you change this from 20 to 18, you should then have 36 running threads.
(I think the answer is #2)
Hope this helps,
Thank you for you answer.@N. Scott Pearson
But if I change it to 20.the oracle database show me the cpu_count is 20,not 40.
And if I close the numbers of processors,the database can not startup.because I think this way the cpu_count=40>36,and the oracle can not support it.
How can I change the cpu_count to 36?