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Don Burleson Blog 







Oracle automatic SQL tuning tips

Oracle Tips by Burleson Consulting
February 3,  2009

Oracle automatic SQL tuning is a misnomer, a product of the Oracle marketing machine.

As I note in my book "Oracle Tuning: The Definitive Reference", SQL tuning is extremely complex, and Oracle has never made a SQL tuning tool that can make anything more than simple recommendations for missing indexes and materialized views.

The first attempt "Oracle Expert" was a total joke, a resource hungry tool that cranked for hours and then made ridiculous recommendations.  In Oracle 11g, Oracle has made some progress toward automatic SQL tuning by applying real-world workloads and measuring changes to execution plans, but it still tunes with about the same skill as a trained dolphin.

Just like it's predecessors, the Oracle automatic SQL tuning tool still makes ludicrous recommendations, but it is a step in the right direction.  The process of tuning SQL is a semi-structured task, where some decision rules exist, but it still requires human intuition and there is no technology that will approach the ability of a human SQL tuning expert.

Today, "fully automatic SQL tuning" is a DSS tool, as it should be.  In a decision support system, the tools managed the easy, well-structured components of the SQL tuning process (the benchmark testing), and the human expert sets-up the tuning tests.

The human expert provides the intelligence and parameters, and Oracle "SQL Tuning Advisor" grabs the real-world workload and manages the well-structured component of the tuning process.

For more, see my related notes on Oracle automatic SQL tuning:

  1. Integration of SQL Plan Management with Automatic SQL tuning

  2. Automatic SQL Tuning with the SQL Tuning Advisor

  3. Oracle 11g fully automated SQL tuning tips

  4. How Automatic SQL Plan Management Works

  5. 11g Cases Scenarios for Automatic SQL tuning

Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.



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