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OS Busy tips

Oracle Database Tips by Donald BurlesonFebruary 3, 2015

How can I tell if my OS is busy?  I want to know if my hardware is overloaded when Oracle is processing.



Answer:  You can display OS (CPU and RAM) with many scripts, and see the Oracle script collection for a complete OS script collection. 


Also see my notes on monitoring UNIX/Linux CPU.   If you suspect a OS utilization problem, see these important notes on 100% CPU and Oracle.  Also see Oracle and OS utilization metrics.


This script will display OS busy statistics


   'OS Busy Time' series, to_char(snaptime, 'yyyy-mm-dd hh24 hh24:mi') snap_time,
   round(busydelta / (busydelta + idledelta) * 100, 2) "CPU Use (%)"
      s.begin_interval_time snaptime,
      os1.value - lag(os1.value) over (order by s.snap_id) busydelta,
      os2.value - lag(os2.value) over (order by s.snap_id) idledelta
      dba_hist_snapshot s,
      dba_hist_osstat os1,
      dba_hist_osstat os2
      s.snap_id = os1.snap_id
      s.snap_id = os2.snap_id

      s.instance_number = os1.instance_number
      s.instance_number = os2.instance_number

      s.dbid = os1.dbid and s.dbid = os2.dbid

      s.instance_number = (select instance_number from v$instance)

      s.dbid = (select dbid from v$database)

      os1.stat_name = 'BUSY_TIME'

      os2.stat_name = 'IDLE_TIME')

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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