Tuning is optimizing performance. A system model of Adaptive Server and its environment can be used to identify performance problems at each layer.
Figure 1-1: Adaptive Server system model
A major part of tuning is reducing the contention for system resources. As the number of users increases, contention for resources such as data and procedure caches, spinlocks on system resources, and the CPU(s) increases. The probability of locking data pages also increases.