This IBM Redbook is designed as a study guide for professionals wishing to prepare for the AIX 5L Performance and System Tuning certification exam as a selected course of study in order to achieve the IBM (cserver Certified Advanced Technical Expert - pSeries and AIX 5L certification.This IBM Redbook is designed to provide a combination of theory and practical experience needed for a general understanding of the subject matter. It also provides sample questions that will help in the evaluation of personal progress and provide familiarity with the types of questions that will be encountered on the exam.