• Kerry Osborne’s Oracle Blog » Blog Archive » What Did My New Index Mess Up? – Kerry Osborne’s Oracle Blog
  find significantly different average elapsed times per execution. It uses AWR data and computes a normalized standard deviation between the average elapsed time per execution before and after the date specified by the days_ago parameter
  in Oracle > DB 11g with 11g analysis awr changed index oracle performance snap snap_id sql_id statistics whats

snap_id from all users