Add virtual processors in online mode with onmode
Use the -p option of the onmode command to add virtual processors while the database server is in online mode.
Specify the number of virtual processors that you want
to add with a positive number. As an option, you can precede the number
of virtual processors with a plus sign (+). Following the number,
specify the virtual processor class in lowercase letters. For example,
either of the following commands starts four additional virtual processors
in the AIO class:
onmode -p 4 aio
onmode -p +4 aio
The onmode utility starts the additional virtual processors immediately.
You can add virtual processors to only one class at a time. To add virtual processors for another class, you must run onmode again.