Oracle Closed World 2010:
Graphing the AAS ala EM + doing 
  some cool linear regression
Who am I?
• Karl Arao, Oracle ACE, OCP‐DBA, RHCT
• Solutions Architect / Principal Consultant @ SQL*Wizard
• Blog: http://...
DBA_HIST_* tables
My first close encounter
gc block lost




http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
AWR Scripts
Visualization
Can’t go back in time?
AAS – Average Active Sessions
Kyle Hailey: http://www.perfvision.com/ftp/emea_2010_may/02_AAS.ppt




       Max CPU




 ...
AAS – the Golden Metric
AAS & CPU count as a yardstick for a possible performance problem (I suggest reading Kyle's 
   st...
awr_topevents.sql
Textual trends
AAS throughout the AWR retention 
                    period!




http://karlarao.wordpress.com/2010/07/25/graphing-the-aa...
Capacity Planning
awr_genwl.sql
http://karlarao.wordpress.com/2010/01/31/workload-characterization-using-dba_hist-tables-and-ksar
U = R / C
where aas > 1
Filter the data points
•   AAS range
           aas > 1

•   Per SNAP_ID or range of SNAP_IDs
           id in (336)
     ...
Straight line graph: Slope‐Intercept Form
                 y = mx + b
AAS vs. CPU% utilization
http://karlarao.tiddlyspot.com/#r2project
“oracpupct” column also has a good linear fit. Since the 
server’s load is CPU centric (see top r2 stats from .92 and 
   ...
AAS vs. CPU% utilization
http://karlarao.tiddlyspot.com/#r2project
Drilling down on the peak workload... 
            with AAS of 10
AAS vs. CPU% utilization
http://karlarao.tiddlyspot.com/#r2project
Now on the low workload period... 
        with AAS of 2.2
AAS vs. CPU% utilization
http://karlarao.tiddlyspot.com/#r2project
Conclusion
References and Tools
•   http://karlarao.wordpress.com
     – http://karlarao.tiddlyspot.com/#%5B%5BStorage%20IOPS%2Ccapac...
Contact me through:

  karao@sqlwizard.com
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression
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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Oracle Closed World 2010: Graphing the AAS ala EM + doing some cool linear regression

  1. 1. Oracle Closed World 2010: Graphing the AAS ala EM + doing  some cool linear regression
  2. 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. 3. DBA_HIST_* tables
  4. 4. My first close encounter
  5. 5. gc block lost http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
  6. 6. AWR Scripts
  7. 7. Visualization
  8. 8. Can’t go back in time?
  9. 9. AAS – Average Active Sessions Kyle Hailey: http://www.perfvision.com/ftp/emea_2010_may/02_AAS.ppt Max CPU Max CPU
  10. 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. 11. awr_topevents.sql
  12. 12. Textual trends
  13. 13. AAS throughout the AWR retention  period! http://karlarao.wordpress.com/2010/07/25/graphing-the-aas-with-perfsheet-a-la-enterprise-manager
  14. 14. Capacity Planning
  15. 15. awr_genwl.sql
  16. 16. http://karlarao.wordpress.com/2010/01/31/workload-characterization-using-dba_hist-tables-and-ksar
  17. 17. U = R / C
  18. 18. where aas > 1
  19. 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. 20. Straight line graph: Slope‐Intercept Form y = mx + b
  21. 21. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  22. 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. 23. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  24. 24. Drilling down on the peak workload...  with AAS of 10
  25. 25. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  26. 26. Now on the low workload period...  with AAS of 2.2
  27. 27. AAS vs. CPU% utilization http://karlarao.tiddlyspot.com/#r2project
  28. 28. Conclusion
  29. 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. 30. Contact me through: karao@sqlwizard.com

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