The document discusses various Oracle performance monitoring tools including Oracle Enterprise Manager (OEM), Automatic Workload Repository (AWR), Automatic Database Diagnostic Monitor (ADDM), Active Session History (ASH), and eDB360. It provides overviews of each tool and examples of using AWR, ADDM, ASH and eDB360 for performance analysis through demos. The conclusions recommend OEM as the primary tool and how the other tools like AWR, ADDM and ASH complement it for deeper performance insights.

1. Oracle Performance
Tools of the Trade
Carlos Sierra

2. • Oracle Performance and SQL Tuning
• Consultant/Developer/DBA
• eDB360 and eAdam
• SQLT and SQLHC
• Exadata
Carlos Sierra
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3. Tools of the Trade
• OEM
• AWR
• ADDM
• ASH
• EDB360
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4. OEM
• Oracle Enterprise Manager (OEM)
– Database Control
– Grid Control
• GUI Tool for System Monitoring
– Including Performance
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What is wrong?

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18. AWR
• Automatic Workload Repository (AWR)
• Requires Oracle Diagnostics Pack License
• Set of DBA_HIST views
• Periodic Snapshots (1hr apart by default)
• 7 days history (by default)
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19. AWR Demo (1)
• Go to: carlos-sierra.net
• Right-hand side
• Downloads
– ECO Demos
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20. AWR Demo (2)
• Average Active Sessions (AAS)?
• DB CPU Utilization?
• Do you see any bottlenecks?
• What would be your action plan?
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35. AWR Demo Conclusions (1)
• High Parsing
– Use of Literals instead of Bind Variables
• Some suboptimal SQL wasting CPU cycles
• High Background Waits related to DBWR
• Write Back Flash Cache disabled
– Hard to detect!
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36. AWR Demo Conclusions (2)
• 6 copies of Control Files
– 2 members in 2 high redundancy disk groups
• Thousands of Tablespaces (thus Data Files)
• Frequent Log switches due to small size
– Think Checkpoints updating SCN on Data Files
and Control Files
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37. AWR Demo Conclusions (3)
• There is usually more than 1 culprit
– Even when performance is fine
• Database health-check is like any other
– Early detection is preferred
• Motto: “if it ain't broke, don't fix it”
– Really?
– Would you apply this motto to your own health?
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38. Alert Log
• As old as Oracle
• Like reading your Daily News
• Watch for ORA errors
– And fix them!
• Rename every so often
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39. ADDM (1)
• Automatic Database Diagnostic Monitor
• Requires Oracle Diagnostics Pack License
• Its goal is to reduce DB Time
– Wait and CPU time of all non-idle user sessions
• Based on AWR data
– Hourly execution by default
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40. ADDM (2)
• Database, Instance or Partial modes
• Available via OEM or SQL*Plus
– DBA_ADVISOR_* and DBA_ADDM_*
• Question Everything, including “Advice”
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ADDM Sample

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43. ASH (1)
• Active Session History (ASH)
• Requires Oracle Diagnostics Pack License
• Active Session
– On CPU; or
– Non-idle Wait
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44. ASH (2)
• Snapshot of V$SESSION every second
– V$ACTIVE_SESSION_HISTORY
– Every 10 seconds on AWR
• DBA_HIST_ACTIVE_SESS_HISTORY
• Source of truth
• Multi-dimension
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ASH Sample

46. EDB360
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• 360-degree view of an Oracle database
• Database health-check and sizing
• 2 Parameters: Pack License [T|D|N] and Days
– @edb360.sql T 31
• Installs nothing
• Free download and use

47. EDB360 Demo (1)
• Go to: carlos-sierra.net
• Right-hand side
• Downloads
– ECO Demos
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EDB360 Demo (2)

49. EDB360 Demo (3)
• When was 11.2.0.3 BP21 applied?
• Is “_parallel_statement_queuing” modified?
• What is CPU peak demand for instance 1?
• How many invalid objects?
• How many SQL Plan Baselines?
• Are CBO System Statistics collected?
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53. Conclusions
• OEM is “the” tool for Oracle Performance
• AWR, ADDM and ASH complement OEM
• EDB360 allows “offline” analysis
• Snapper is a good “session level” tool
• SQL Tuning requires the use of specialized
tools
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54. References
• Oracle Database Performance Tuning Guide
11g Release 2
• Snapper - Tanel Poder
– http://blog.tanelpoder.com/files/scripts/snapper
4.sql
• http://www.enkitec.com/products/edb360
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55. Contact Information
• carlos.sierra@enkitec.com
• carlos-sierra.net
• @csierra_usa
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