CPU_COUNT

Property	Description
Parameter type	Integer
Default value	Set automatically by Oracle
Modifiable	`ALTER SYSTEM` Oracle strongly recommends that you do not alter the value of this parameter. If it is necessary to do so, please refer to your operating system-specific documentation for further information.
Range of values	0 to unlimited
Basic	No

Caution:

On most platforms, Oracle automatically sets the value of CPU_COUNT to the number of CPUs available to your Oracle instance. Do not change the value of CPU_COUNT.

CPU_COUNT specifies the number of CPUs available to Oracle. On single-CPU computers, the value of CPU_COUNT is 1.