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RichardTo |
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Monday, October 30, 2006 2:28 PM |
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Solving problems in your SQL code, tune queries, and share new tips, tricks, and techniques |
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A SQL Performance History from AWR |
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RichardTo
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Thursday, September 13, 2007 2:51 PM
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I have been working on SQL Tuning research for more than 10 years, but my focus has changed to time-series forecast technology in the last two years. Recently, Oracle’s AWR and other database vendor’s statistics/metrics repository have drawn my attention. The relatively low cost of keeping performance statistics in databases, combined wi ...
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How Quest SQL Optimizer works with Hints |
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RichardTo
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Tuesday, August 14, 2007 10:28 AM
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Today database vendors are more willing to provide a means for the end user to influence the decision of which execution plan to use for a SQL statement. They provide this because database optimizers cannot guarantee that they the will generate the best execution plan for a given SQL statement. However, when you do apply Optimization Hints you ...
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Quest Recursive SQL Transformation Technology |
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RichardTo
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Wednesday, June 20, 2007 4:58 AM
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Quest Recursive SQL Transformation technology is an innovative AI technology that simulates human SQL transformation technique. It incorporates a set of transformation rules to transform SQL statements on a section-by-section basis. This replaces the trial and error method used by human to rewrite the syntax of a SQL statement. Each t ...
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From SQL Optimization Hints to Plan Instructions |
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RichardTo
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Wednesday, May 02, 2007 7:05 AM
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Most database vendors provide optimization hints which enable a user to influence the decision the database SQL optimizer will make when determining which execution plan it will choose. Oracle provides a full set of optimization hints to help users to rectify an i ...
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Dummy SQL Transformation Rules? |
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RichardTo
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Thursday, March 01, 2007 10:33 AM
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I have been asked many times that why there are some dummy SQL transformations/rewrites that look meaningless, but it works in certain situations. Let me give you some examples that may help to explain what theory on behind of Quest SQL Optimizer.
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Transformation Rules Relating to Index Usage |
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RichardTo
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Friday, February 09, 2007 8:25 AM
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In Quest SQL Optimizer, transformation rules relating to index usage are designed to guide the database SQL optimizer as to how it should use the indexes for a specific SQL statement. Although those rules may familiar to most of SQL developers, but it is still worth to illustrate some commonly used rules for SQL beg ...
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