What’s new in Diagnostics and Tuning in 11g

作者: Maclean Liu , post on December 18th, 2010 , English Version
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转载请注明:文章转载自: Oracle Clinic – Maclean Liu的个人技术博客 [http://www.oracledatabase12g.com/]
本文标题: What’s new in Diagnostics and Tuning in 11g
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Manageability Value Propositions

  • Lower Management Costs
    • Largest line item in TCO is management cost – not license cost
    • Costs increasing with growth in system complexity and size
    • Self-managing systems significantly lower managements costs
  • Increase System Availability
    • System unavailability no longer an option
    • Unplanned down-time must be minimized/eliminated
    • Eliminate Human Error – # 1 cause of unplanned down-time
  • Meet/Exceed Service Level Agreements (SLA’s)
    • System performance impacts business productivity
    • Business must meet their SLA’s
    • Deliver reliable and predictable performance by proactive auto-tune

Problem: Managing High Response-Time SQLs

  • Monitoring: tracking high response-time SQL
    • What is that expensive SQL (ETL, DDL, batch, report, …) I started up to?
    • Do I have any high response-time SQL running on my OLTP system?
    • Any SQL executing parallel?
  • Investigating: why is this execution so expensive?
    • Plan has hundreds of operations — where is the time being spent?
    • Why is a particular operation so expensive?
    • SQL runs parallel, is DOP appropriate? is there a skew?
  • What is going on inside a SQL execution???

Solution: Real-time SQL Monitoring

  • Shows what’s happening inside SQL execution
  • Automatically monitors long running SQL
  • Enabled out-of-the-box with no performance impact
  • Monitors each SQL execution
  • Exposes monitoring statistics
    • Global execution level
    • Plan operation level
    • Parallel Execution level


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