3.2 Practical tuning
                        ----------------

To tune your existing system you should [STUN72]:

  1. Tune OS hardware and software (see chapter 5 below).

  2. Identify performance bottelneck by querying the
     V$SESSION_WAIT view. This view lists events that cause
     session to wait: what each session is currently waiting for
     or what the session last waited for.

  3. Determine teh cause of the bottleneck by analyzing the data
     in V$SESSION_WAIT.

  4. Correct the problem.