When you first install Adaptive Server, the system is configured for a single engine. To use multiple engines, reset the number of engines the first time you restart the server. You may also want to reset the number of engines at other times. For example, you might want to:
Increase the number of engines if current performance is not adequate for an application and there are enough CPUs on the machine.
Decrease the number of engines if Adaptive Server is not fully utilizing the existing engines. There is overhead involved in running the engines, and Adaptive Server is wasting resources if you do not need the extra engines.