title: Is it meaningful to monitor physical memory usage on AIX?
body: <p>Due to AIX's special memory-using algorithm, is it meaning to monitor the physical memory usage in order to find out the memory bottleneck during performance tuning? 
     If not, then what kind of KPI am i supposed to keep eyes on so as to determine whether we need to enlarge the RAM capacity or not?</p>
  
  <p>Thanks</p>