virtathon 2011 - mining the awr
TRANSCRIPT
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Mining the AWR repository for Capacity Planning, Visualization,
& other real world stuff
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Who am I?
• Karl Arao, Oracle ACE, OCP‐DBA, RHCE• Currently @ Enkitec ‐ Senior Technical Consultant • Formerly @ SQL*Wizard ‐ Solutions Architect• Blog: http://karlarao.wordpress.com• Wiki: http://karlarao.tiddlyspot.com• Twitter: http://twitter.com/karlarao
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What will I talk about?
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Overwhelming
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DBA_HIST_* views
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My first close encounter
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gc block lost – sudden slow down
http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
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gc block lost – sudden slow down
http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
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gc block lost – sudden slow down
http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
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gc block lost – sudden slow down
http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
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After gc block lost – normal workload
http://karlarao.wordpress.com/2009/06/07/diagnosing-and-resolving-gc-block-lost
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Utilization = Requirement / Capacity
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Double Y Axis Graph
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t1 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐> t0335 – 336 – 337 – 338 – 339
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delta issue
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AWR Scripts
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Visualization
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Can’t go back in time?
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AAS – Average Active SessionsKyle Hailey: http://www.perfvision.com/ftp/class/02_AAS.ppt
Max CPU
Max CPU
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AAS – the Golden MetricAAS & CPU count as a yardstick for a possible performance problem:if AAS < 1 ‐‐ Database is not blockedAAS ~= 0 ‐‐ Database basically idle‐‐ Problems are in the APP not DBAAS < # of CPUs‐‐ CPU available‐‐ Database is probably not blocked‐‐ Are any single sessions 100% active?AAS > # of CPUs‐‐ Could have performance problemsAAS >> # of CPUS‐‐ There is a bottleneck
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AAS from V$ACTIVE_SESSION_HISTORYAAS = Sample Count / Elapsed Time
= 19410 / 600= 32.35
CPU count = 4
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AAS from DBA_HIST_ACTIVE_SESS_HISTORYAAS = (Sample Count * 10) / Elapsed Time
= (1950 * 10) / 600= 32.5
CPU count = 4
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AAS from AWR ReportAAS = DB Time / Elapsed Time
= 291.81 / 9.10= 32.07
CPU count = 4
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AAS from AWR Top EventsAAS = DB Time / Elapsed Time
291.81 / 9.10 = 32.07
AAS = Event Time / Elapsed Time17410 / 546 = 31.9
CPU count = 4
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awr_topevents.sql
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Textual trends
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AAS throughout the AWR retention period!
http://karlarao.wordpress.com/2010/07/25/graphing-the-aas-with-perfsheet-a-la-enterprise-manager
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Capacity Planning
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Utilization is the ultimate metric!
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awr_genwl.sql
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http://karlarao.wordpress.com/2010/01/31/workload-characterization-using-dba_hist-tables-and-ksar
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U = R / C
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where aas > 1
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Filter the data points• AAS range
aas > 1
• Per SNAP_ID or range of SNAP_IDsid in (336)where id >= 336 and id <= 340
• Oracle CPU Utilizationoracpupct > 50
• OS CPU Utilizationoscpupct > 50
• Workload periods
AND TO_CHAR(s0.END_INTERVAL_TIME,'D') >= 1 ‐‐ Day of week: 1=Sunday 7=SaturdayAND TO_CHAR(s0.END_INTERVAL_TIME,'D') <= 7AND TO_CHAR(s0.END_INTERVAL_TIME,'HH24MI') >= 0900 ‐‐ HourAND TO_CHAR(s0.END_INTERVAL_TIME,'HH24MI') <= 1800AND s0.END_INTERVAL_TIME >= TO_DATE('2010‐jan‐17 00:00:00','yyyy‐mon‐dd hh24:mi:ss') ‐‐ Data rangeAND s0.END_INTERVAL_TIME <= TO_DATE('2010‐aug‐22 23:59:59','yyyy‐mon‐dd hh24:mi:ss‘)
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core need = # of cores * utilization * 1.25Database Consolidation Best Practices
http://husnusensoy.files.wordpress.com/2010/05/database‐consolidation‐best‐practices.pdf
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Total disk IOPS = (IOPS * Read Ratio) + (IOPS * Write Ratio * RAID penalty)
Number of disk = Total disk IOPS / IOPS per disk
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awr_iowl.sql
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Average latency issue
60 minutes interval 10 minutes interval
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latency (ms) = (readtim / phy reads) * 10
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Linear Regression
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x data (CPU) = is the "independent value", used to predict the value of y
y data (AAS) = is the "dependent value", variable whose value is to be predicted
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r2toolkit
Uses the following inbuilt Oracle functions:
•regr_count•regr_r2•regr_intercept•regr_slope
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r2toolkit
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Linear Regression – what’s the value?
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Linear Regression on 2 node RAChttp://karlarao.tiddlyspot.com/#r2project
racnode1 racnode2
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Drilling down on the peak workload... with AAS of 10
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Drilling down on the peak workload... with AAS of 10
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Now on the low workload period... with AAS of 2.2
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Now on the low workload period... with AAS of 2.2
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Recap
• Mine the beautiful data set
• Visualization tell a story immediately
• Statistics to make sense of data
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Let the AWR data set
change your mind set!
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Thank you!
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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 Consolidationhttp://resources.orapub.com/product_p/server_consolidation_ppt.htm
• Husnu Sensoy @ husnusensoy.wordpress.com – Database Consolidation Best Practiceshttp://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