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Interpreting AWR compare report

edited Nov 13, 2013 11:52AM in Database Tuning (MOSC) 1 commentAnswered
Oracle 10.2.0.4Linux  2.6.9-67.0.4.0.1.ELsmp 

I ran the AWR compare report for the 15 minutes before and the 15 minutes of an outage.  During the outage the CPU spiked to 100% and the applications were unable to connect to the database(s) running on the server.

The comparison shows a huge difference in the SYS_TIME.    My theory is that this indicates that a process external to the database is using the CPU.  I'm having a hard time finding a concise/consistent description of what these numbers really mean.

Operating System Statistics

  • Ordered by 'Statistic Name'
 Valueper Second (DB Time)per Second (Elapsed Time)per TransStatistic Name1st2nd1st2nd%Diff1st2nd%Diff1st2nd%DiffBUSY_TIME161,214572,173454-92.15179643259.1002762.96IDLE_TIME558,734138,2681571-99.45621155-74.9611-40.43IOWAIT_TIME109,14245,757310-99.0612151-57.58005.56LOAD-121-000.00-00100.00-000.00NICE_TIME00000.00000.00000.00NUM_CPU_SOCKETS00000.00000.00000.00PHYSICAL_MEMORY_BYTES00000.00000.00000.00RSRC_MGR_CPU_WAIT_TIME00000.00000.00000.00SYS_TIME20,241491,03563-46.22225522,354.49026,566.67USER_TIME135,55077,177380-98.7415187-42.390034.78

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