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  • Script to find Total wait time by resource types in Oracle

    Script will display total wait time by resource types.

    column average_wait format 9999990.00
    
    select
      substr(e.event, 1, 40)  event,
      e.time_waited,
      e.time_waited / (
        e.total_waits - decode(e.event, 'latch free', 0, e.total_timeouts)
      )  average_wait
    from
      sys.v_$system_event  e,
      sys.v_$instance  i
    where
      e.event = 'buffer busy waits' or
      e.event = 'enqueue' or
      e.event = 'free buffer waits' or
      e.event = 'global cache freelist wait' or
      e.event = 'latch free' or
      e.event = 'log buffer space' or
      e.event = 'parallel query qref latch' or
      e.event = 'pipe put' or
      e.event = 'write complete waits' or
      e.event like 'library cache%' or
      e.event like 'log file switch%' or
      ( e.event = 'row cache lock' and
        i.parallel = 'NO'
      )
    union all
    select
      'non-routine log file syncs',
      round(e.average_wait * greatest(e.total_waits - s.value, 0)),
      e.average_wait
    from
      sys.v_$system_event e,
      sys.v_$sysstat s
    where
      e.event = 'log file sync' and
      s.name = 'user commits'
    order by
      2 desc
    /


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