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Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
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Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression

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  • 1. Oracle Closed World 2010: Graphing the AAS ala EM + doing  some cool linear regression
  • 2. Who am I? • Karl Arao, Oracle ACE, OCP‐DBA, RHCT • Solutions Architect / Principal Consultant @ SQL*Wizard • Blog: http://karlarao.wordpress.com • Wiki: http://karlarao.tiddlyspot.com
  • 3. DBA_HIST_* tables
  • 4. My first close encounter
  • 5. gc block lost http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
  • 6. AWR Scripts
  • 7. Visualization
  • 8. Can’t go back in time?
  • 9. AAS – Average Active Sessions Kyle Hailey: http://www.perfvision.com/ftp/emea_2010_may/02_AAS.ppt Max CPU Max CPU
  • 10. AAS – the Golden Metric AAS & CPU count as a yardstick for a possible performance problem (I suggest reading Kyle's  stuff about this): if AAS < 1  ‐‐ Database is not blocked AAS ~= 0  ‐‐ Database basically idle ‐‐ Problems are in the APP not DB AAS < # of CPUs ‐‐ CPU available ‐‐ Database is probably not blocked ‐‐ Are any single sessions 100% active? AAS > # of CPUs ‐‐ Could have performance problems AAS >> # of CPUS ‐‐ There is a bottleneck
  • 11. awr_topevents.sql
  • 12. Textual trends
  • 13. AAS throughout the AWR retention  period! http://karlarao.wordpress.com/2010/07/25/graphing-the-aas-with-perfsheet-a-la-enterprise-manager
  • 14. Capacity Planning
  • 15. awr_genwl.sql
  • 16. http://karlarao.wordpress.com/2010/01/31/workload-characterization-using-dba_hist-tables-and-ksar
  • 17. U = R / C
  • 18. where aas > 1
  • 19. Filter the data points • AAS range aas > 1 • Per SNAP_ID or range of SNAP_IDs id in (336) where id >= 336 and  id <= 340 • Oracle CPU Utilization oracpupct > 50 • OS CPU Utilization oscpupct > 50 • Workload periods AND TO_CHAR(s0.END_INTERVAL_TIME,'D') >= 1     ‐‐ Day of week: 1=Sunday 7=Saturday AND TO_CHAR(s0.END_INTERVAL_TIME,'D') <= 7 AND TO_CHAR(s0.END_INTERVAL_TIME,'HH24MI') >= 0900     ‐‐ Hour AND TO_CHAR(s0.END_INTERVAL_TIME,'HH24MI') <= 1800 AND s0.END_INTERVAL_TIME >= TO_DATE('2010‐jan‐17 00:00:00','yyyy‐mon‐dd hh24:mi:ss')    ‐‐ Data range AND s0.END_INTERVAL_TIME <= TO_DATE('2010‐aug‐22 23:59:59','yyyy‐mon‐dd hh24:mi:ss‘)
  • 20. Straight line graph: Slope‐Intercept Form y = mx + b
  • 21. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  • 22. “oracpupct” column also has a good linear fit. Since the  server’s load is CPU centric (see top r2 stats from .92 and  above), why not use it?  AAS(y) against CPU% Utilization(x) will be more  meaningful/readable instead of “CPU used by this session”
  • 23. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  • 24. Drilling down on the peak workload...  with AAS of 10
  • 25. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  • 26. Now on the low workload period...  with AAS of 2.2
  • 27. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  • 28. Conclusion
  • 29. References and Tools • http://karlarao.wordpress.com – http://karlarao.tiddlyspot.com/#%5B%5BStorage%20IOPS%2Ccapacity%2Cperformance %2Ccost%5D%5D – http://karlarao.tiddlyspot.com/#Statistics – http://karlarao.tiddlyspot.com/#OraclePerformance • Tanel Poder @ http://blog.tanelpoder.com – http://www.tanelpoder.com/files/TPT_public.zip – http://www.tanelpoder.com/files/PerfSheet.zip – Neil Gunther & Tanel Poder ‐ Multidimensional Visualization of Oracle Performance  using Barry007 http://arxiv.org/pdf/0809.2532 • Kyle Hailey @ http://ashmasters.com , http://www.perfvision.com • Craig Shallahamer @ orapub.com – Introduction To Oracle Server Consolidation http://resources.orapub.com/product_p/server_consolidation_ppt.htm • Husnu Sensoy @ husnusensoy.wordpress.com – Database Consolidation Best Practices http://husnusensoy.files.wordpress.com/2010/05/database‐consolidation‐best‐ practices.pdf • Andy Rivenes @ http://www.appsdba.com/pubs.htm • Neeraj Bhatia @ www.nioug.org/files/Linear_Regression.pdf
  • 30. Contact me through: karao@sqlwizard.com